(And how to use it!) The Best Chain Lock

Chain locks are made up of a lock and a series of hardened steel links (which are usually encased in a protective nylon sleeve). The lock can be built into the chain or used as a stand-alone padlock.

Chain locks are beneficial in a number of ways:

To begin with, their length and flexibility allow you to secure your bike to a variety of objects.

Second, they can be wrapped around your seat post and carried easily, so you won’t have to deal with any of those pesky u-lock frame mounts!

Chains are simple to transport around your seat post.

   &n They’re also harder to cut with power tools. They can’t be jacked or leveraged open, for example. Finally, they are more resistant to some of the most common attacks on other types of bike locks.

Chain locks are significantly heavier than u-locks with comparable levels of security. These benefits, however, come at a significant cost: they are extremely heavy.

As a result, we must divide chain locks into two categories:

  1. those that are light enough to be carried around on a bicycle every day
  2. Those that are so heavy that they must be kept in one location at all times.

After that, we’ll be able to find the best chain lock for you. So, before you go out and buy a chain lock, think about what you really want: portable or stationary security.

Don’t worry, we’ll take care of everything…

Let’s start with the characteristics that both groups share and what we should look for when purchasing a chain lock.

The Link

The chain’s links should be made of a high-quality, core-hardened steel alloy that isn’t too brittle for reliable security. Not all chains are made out of the same metal.

Buying from a reputable brand like Kryptonite, OnGuard, Abus, or Pragmasis is the easiest way to ensure this.

The edges of chain links are usually rounded. Some security chains, on the other hand, now have hexagonal or square links.

Bolt cutters are supposed to have a harder time gripping these and the cropping pressure is supposed to be spread out over a larger area. They’re supposed to be more difficult to crop…

Hexagonal chain links: they aren’t any safer…

…as opposed to round chain links

In fact, these variously shaped links provide no additional protection than round links. They might be a lot easier to crop! Used bolt cutters, on the other hand, will have nicks in the blades that will catch the edges of such links, making it easier to get a good grip.

However, the chain lock is obviously more difficult to break if the links are thicker…

Thickness of Chain Links

Is it possible to use bolt cutters to cut it?


(Medium size) Yes

13 mm to 15 mm

Yes (only the 36″ and 42″ sizes).

16 mm and higher


If the thief can get the chain in a good position, links with diameters less than 10 mm can be cut relatively easily with medium sized bolt cutters.

Medium-sized bolt cutters can sometimes cut links with diameters of 10 to 12 mm if the thief knows what they’re doing and can get good leverage on the chain.

Links with a diameter of 13 to 15 mm, on the other hand, can only be cut with the largest 42″ bolt cutters, which most bike thieves will not have.

Even the largest hand-operated bolt cutters can’t cut links that are 16 mm or larger.

Chain links with a diameter of 16 mm are extremely large and heavy!

However, regardless of its thickness, keeping your chain as far off the ground as possible when locking your bike can significantly reduce the chances of it being cropped.

The thief will need to use one arm of the bolt cutter against the ground as leverage in order to crop a decent chain. The higher your lock is above ground, the more difficult and ineffective it will be to open.

The Keyhole

So it’s pointless to have a super thick, super strong chain if you’re only using a cheap, feeble padlock to secure it! Any bicycle lock is only as good as its weakest link.

Padlocks or mini u-locks are sometimes used. The locking mechanisms on chain locks are usually self-contained. They’re sometimes permanently attached to one end of the chain.

In either case, the locking mechanism must be dependable and resistant to leverage attacks, such as picking, pulling, or drilling.

Shackles should be at least as thick as chain, if not thicker.

… shrouded in such a way that it can’t be cropped

If a shackle is used, it should be as thick as (or thicker than) the chain links or shrouded from bolt cutters.

Weight vs. Chain Lock Length

One of the advantages of chain locks (over u-locks) is that their (generally) longer length allows you to secure your bike to a wider range of objects.

However, the greater the overall weight, the longer the lock. And chain locks quickly become very heavy.

They can be easily attached to your luggage rack, carried in your basket, or wrapped around your seat post, which is true. Even the lighter chains are frequently too heavy to comfortably carry in a backpack.

However, in order to save weight, you should choose the shortest length that allows you to lock your bike wherever and however you want.

Measure out a length of rope and make sure it’s long enough to use wherever you normally lock your bike before you buy a chain lock. But be careful, some of the short ones are actually quite short!

After all of this, you’ll just have to accept that a chain lock will always be heavier than a u-lock that offers equivalent security…

Chain Lock Kryptonite Kryptolok

The length of the piece is:

55 cm (21.5″)


1.77 kg (3.90 lb)

Rating for safety:

6 out of 10

U-Lock Kryptonite Kryptolok

Internal Rooms:

55 cm (21.5″)


1.29 kg (2.85 lb)

Rating for safety:

6 out of 10

The Kryptonite Kryptolock Series 2 u-lock, for example, weighs 2.85 lb (1.29 kg). The lightest Kryptolock Series 2 chain lock weighs 3.90 pounds (1.77 kilograms), nearly a pound and a third of a kilogram more.

And, at only 21.5†(55 cm) in length, it won’t give you a lot of extra options when it comes to locking your bike.

A more practical 37.5†(95 cm) Krytolock Series 2 chain lock is available, but it weighs nearly twice as much as the u-lock at 5.55 lbs (2.52 kg).

If this is an issue, invest in a u-lock or a folding lock. Chain locks are cumbersome!

How to Select the Most Appropriate Chain Lock!

It’s a fairly obvious distinction… I’m guessing you’ve already decided between a mobile and a stationary lock.

Every day, you’ll carry a mobile chain lock on your bike and secure it around your bike and various street furniture in your neighborhood.

A stationary chain lock, on the other hand, will be left at home (or wherever you leave your bike overnight) and will only be used there to secure your bike (or, more likely, multiple bikes) for longer periods of time.

Do you want a chain lock that you can use at home and carry with you every day? But what if you want the best of both worlds? However, they aren’t particularly good at either. There are locks that can do both of these things.

The most secure and practical option is usually a two-lock system (one for daily use on the street and another kept at home for overnight protection).

But don’t worry, we’ll cover everything…

Choosing a chain lock that is portable

What level of security should your chain lock provide?

Checking the ratings from the independent testing house Sold Secure is the best way to determine the security level of any bike lock.

Check out my guide to choosing the best bike lock for more information on Sold Secure and why they provide the best measure of bike lock security.

All you need to know is that Sold Secure tests and measures bike locks to determine their level of security, assigning each one a Bronze (least secure), Silver, Gold, or Diamond (highest level of security) rating.

But how do you figure out which Sold Secure rating you’ll require? The best way to find out is to take the quiz below and answer the three quick questions.

(This quiz is brand new! Thank you.) Please let me know if you have any problems with it by sending me a message.

The quiz should recommend Silver, Gold, or Diamond rated bike locks based on your answers to the three questions. Bronze locks are insufficiently secure in any situation, so I do not recommend them!

The same is true for locks with a Gold or Diamond rating. As a result, some Silver-rated locks are more secure than others. Within each rating, there is a lot of variation in security.

When it comes to chain locks, the link thickness will play a big role. You’ll be choosing a more secure Silver (or Gold, or Diamond) chain link if you choose a thicker one.

What length chain lock should you use?

Chain locks are more flexible and longer than u-locks, so they can go where u-locks can’t. One advantage of a chain lock over a u-lock is the additional options it provides when looking for a place to lock your bike.

The more options you have, the longer the chain lock is. Longer chains, on the other hand, are both heavy and expensive.

If necessary, a length of rope can be used to figure it out. As a result, get the shortest length you require to secure your bike.

But how should you use a portable chain lock to secure your bike? I wouldn’t recommend using a chain lock to secure your frame and wheels.

You can keep the chain shorter (and lighter) if you only use it to secure your frame (tightly wrapped around your top tube). Even more importantly, because it will be higher off the ground, it will be much more difficult for a thief to crop it.

I’ve also written a lot more about how to properly lock your bike. There are a slew of other options for keeping your wheels secure!

How will you transport your chain lock?

The best way to carry a chain lock is wrapped around your seat post (although some brands sell bags that you can strap to your frame).

Is there room on your seat post for another person? When riding, there are other places to put your lock, but chains are more difficult to use than other bike locks. Before you buy one, make sure you’ve given it some thought. Is there room in your bag or panniers if not?

Chain locks with a 6 mm diameter

They are far too easily cropped or cut. Under no circumstances would I recommend a chain lock with a diameter of 6 mm.

And I’ve never seen a 6 mm chain lock with a rating higher than Sold Secure Bronze, which isn’t good enough to keep our bikes safe!

The tex-lock is a 6 mm chain encased in a thick textile cover that gives it the appearance and feel of a rope rather than a chain lock! There is, however, one very unusual exception.

The Tex-lock is extremely versatile when combined with the X-lock!

And when combined with their Gold-rated X-lock, you’ve got yourself a very versatile bike lock… The textile layer adds enough extra security that Sold Secure has given the chain a Silver rating.

You can use the X-lock to secure your frame and the chain to protect your wheels in high-risk situations. You can use the chain to secure the frame (and the X-lock to protect one wheel) in lower-risk situations, and the extra length gives you a lot of locking options!



the amount of weight

Ratings for security

Eyelet Tex-lock and X-lock S

31.5″ tall

(length: 80 cm)

3.13 pound

(1.42 kilograms)

Tex-lock Eyelet and X-lock M are two types of eyelets.


(120% of height)

3.73 pound

(1.69 kilograms)

Eyelet Tex-lock and X-lock L

63.0 inches

(1.60 meter)

4.28 pound

(1.94 kilograms)

But take care…

And find out how it made my list of the best lightweight bike locks! To get the most out of this chain lock, you’ll need to understand the different security levels of the various parts (and how to use them properly), so read my full tex-lock review here!

Update: Use the code “bestbikelock10” to get 15% off any purchase on the Tex-lock website.

Chain locks with a 7 mm diameter

But, with a Silver rating from Sold Secure, the Kryptonite Keeper is probably the best of the bunch… Chain locks with a diameter of 7 mm are at the very low end of acceptable protection for your bike.

To check prices at Amazon (or other retailers), click on the links in the table.



the amount of weight

Ratings for security

755 Kryptonite Kryptolok Keeper

55 cm/21.5″

2.06 pound

(0.93 kilograms)

Keeper of Kryptonite Kryptolok 785

33.5″ tall

85 centimeters

3.50 pound

(1.59 kilograms)

Keeper of Kryptonite Kryptolok 712

47.3″ tall

(120% of height)

3.75 pound

(1.70 kilograms)

You might be able to get away with a 7 mm chain lock if your circumstances are low-risk. Simply don’t leave your bike unattended for long periods of time, and use caution when locking it.

This places it too close to the ground, making it relatively easy for thieves to cut it with a pair of bolt croppers. I strongly advise you not to secure your wheels with a 7mm chain lock.

Wrap the chain lock around your top tube and whatever you’re locking the bike to instead. This will keep the lock off the ground, making it impossible for a thief to get close enough to open it.

If the thief has large enough bolt cutters and enough strength, I believe this chain lock could still be cropped without using the ground. However, many bike thieves will not!

How do you feel about your wheels? Well, I’m guessing your bike and wheels aren’t particularly expensive or desirable if you’re using a 7 mm chain lock.

Otherwise, there are plenty of other options for wheel protection that don’t jeopardize the entire bike.    &n As a result, you might be able to get away with just replacing the quick release levers with standard bolts.

Chain locks with an 8 mm diameter

They’re only 1 mm thicker than the 7 mm chains, and while this increases their security, Sold Secure only gives them a Silver rating…

To check prices at Amazon (or other retailers), click on the links in the table.



the amount of weight

Ratings for security

CN8 600 Squire Mako


60 centimeters

2.87 pound

(1.3 kilograms)

9808/85 Abus Steel-O-Chain

85 cm/33.5″

3.86 pound

(1.75 kilograms)

Original Hiplok

85 cm/33.5″

1.85 kg (4.08 lb)

8210/85 Abus Iven Chain

85 cm/33.5″

1.934 kg (4.26 lb)

CN8 900 Squire Mako

” 35.43″

(length: 90 cm)

3.75 pound

(1.7 kilos)

Mako Combi CN8 900 Squire

90 cm (35.4″)

1.69 kg (3.73 lb)

8210/110 Abus Iven Chain

(110 cm) 43″

2.497 kg (5.5 lb)

9808/110 Abus Steel-O-Chain

(110 cm) 43″

2.55 kg/5.62 lb

9808/140 Abus Steel-O-Chain

140 cm/55″

6.17 pound (2.8 kg)

9808/170 Abus Steel-O-Chain

170 cm/67″

3.21 kg/7.08 lb

This means it’s a lot lighter than chains of similar size (or even smaller). The Hiplok Original [Amazon] chain lock is my personal favorite. It has the best length-to-weight ratio.

It also has an integrated Velcro strap that allows it to be worn as a belt around your waist!

Hiploks can also be used as a belt!

   &n And the weight is distributed in such a way that you won’t even notice it’s there. It’s simple and quick to put on. This is a very practical way to transport your chain lock.

However, it’s worth noting that the weight of these locks is increasing. Many Sold Secure Gold rated standard size u-locks are heavier than the lightest 85 cm Abus chain lock in the table above!

Again, with 8 mm chains, I recommend securing your bike by wrapping the lock tightly around your top tube, preventing it from being maneuvered close to the floor, where bolt cropper attacks are common.

9-millimeter chain locks

Several of them have Sold Secure Gold ratings.    &n The chain locks become significantly more secure at 9 mm.

However, keep in mind that the Gold rating is usually accompanied by a 2/5 ART rating, putting these locks at the bottom of the Gold scale.

To check prices at Amazon (or other retailers), click on the links in the table.



the amount of weight

Ratings for security

Kryptonite, also known as KryptoLok, is a type of Kryptonite.

955 Mini Series 2

55 cm/21.5″

3.90 pound

(1.77 kilograms)

Abus CityChain1010/85 Abus CityChain1010/85 Abus CityChain10

85 cm/33.5″

1.95 kg (4.4 lb)

Kryptonite KryptoLokSeries 2 995 Kryptonite KryptoLokSeries 2 995 Kryptonite Kry

95 cm/37.5″

2.52 kg/5.55 lb

Abus CityChain1010/110 Abus CityChain1010/110 Abus CityChain10

(110 cm) 43″

2.40 kg/5.29 lb

Kryptonite KryptoLok 990 Combo Kryptonite KryptoLok 990 Combo

35.5″ tall

(length: 90 cm)

5.85 pound

(2.65 kilograms)

Abus CityChain1010/140 Abus CityChain1010/140 Abus CityChain10

140 cm/55″

6.04 pound (2.744 kg)

Combo Chain Kryptonite KryptoLok 912

Kryptonite KryptoLokSeries 2 915 Kryptonite KryptoLokSeries 2 915 Kryptonite Kry

150 cm 59″

3.67 kg (8.10 lb)

Abus CityChain1010/170 Abus CityChain1010/170 Abus CityChain10

170 cm/67″

3.38 kg (7.45 lb)

   &n To be honest, the Kryptonite Kryptolok Series 2 [Amazon] chain lock and the Abus City Chain 1010 [Amazon] chain lock aren’t that different.

They’re both Sold Secure Gold-rated. However, both provide good mid-level security rather than high security (see ART’s 2/5). Both have built-in locks (as do most chains over 12 mm).

While Kryptonite chain locks are usually less expensive! The Abus chains, on the other hand, have a better weight-to-length ratio (being lighter than the Kryptonite chains).

Kryptonite Kryptolok is a good mid-security option.

For bikes worth up to $1,500 / £800, the Kryptonite chain locks are also eligible for an optional anti-theft protection.

Both are available in a variety of lengths. However, rather than using longer chains to secure your wheels, I recommend going with the shorter chains and wrapping them tightly around your top tube.

As previously stated, this keeps them off the floor, where they are more likely to be cut by bolt croppers. And there’s no doubt that a 9 mm chain lock can be cropped!

Don’t forget that 9 mm locks are quite heavy! Kryptonite and Abus, on the other hand, sell carry cases and bags that can be strapped to your frame. You can wrap them around your seat post, of course.

Because these cases keep the chains close to the frame, they should outperform most u-lock frame brackets (which are unstable due to their offset center of gravity).

However, before you buy, double-check the weights. Because people are often taken aback when they first receive their chain lock and feel the weight in their hands!

Read my complete Kryptonite Kryptolok Series 2 955 Mini chain lock review.

Chain locks with a 10 mm diameter

However, they’re quite heavy… We’re approaching the limit of portable security at 10 mm. Certainly, the shorter chains can be used as on-the-go bike locks.

To check prices at Amazon (or other retailers), click on the links in the table.



the amount of weight

Ratings for security

1055 Mini Kryptonite Evolution Series 4

55 cm/21.5″

2.10 kg (4.40 lb)

Abus Granit CityChainX-Plus 1060/85 Abus Granit CityChainX-Plus 1060/85 Abus Granit CityCha

85 cm/33.5″

4.63 pound (2.1 kg)

Hiplok Gold is a gold-colored hiplok.

85 cm/33.5″

4.85 pound (2.2 kg)

Viking 90 Seatylock

90 cm/35.4″

5.3 pound (2.4 kg)

1090 Kryptonite Evolution Series 4

90 cm (36″)

2.77 kg/6.10 lb

Abus Granit CityChainX-Plus 1060/110 Abus Granit CityChainX-Plus 1060/110 Abus Granit CityCha

(110 cm) 43″

2.65 kg/5.84 lb

8020Mastiff OnGuard

(110 cm) 43″

2.70 kg/5.95 lb

Viking Seatylock 110

43.3″ (110 cm) x 43.3″ (110 cm) x 43.3″

2.8 kg (6.2 lb)

8019Mastiff OnGuard

(110 cm) 43″

6.39 pound (2.9 kg)

Abus Granit CityChainX-Plus 1060/140 Abus Granit CityChainX-Plus 1060/140 Abus Granit CityCha

140 cm/55″

3.26 kg/7.19 lb

Viking Seatylock 140

140 cm/55″

3.40 kg/7.50 lb

Kryptonite Evolution Series 4 1016Kryptonite Evolution Series 4 1016Kryptonite Evolution Series 4 10

160 cm/63″

4.40 kg (9.70 lb)

Abus Granit CityChainX-Plus 1060/170 Abus Granit CityChainX-Plus 1060/170 Abus Granit CityCha

170 cm/67″

3.75 kg (8.27 lb)

8021Mastiff OnGuard

72″(183 cm) x 72″(183 cm) x 72″(

8.38 pound (3.8 kg)

8019LMastiff OnGuard

72″(183 cm) x 72″(183 cm) x 72″(

4.21 kg (9.28 lb)

The Kryptonite 1055 Mini, the smallest (and lightest) 10 mm chain lock in the table above, is nearly as heavy as the 18 mm Kryptonite New York Fahgettaboudit Mini (one of the heaviest u-locks).

And that’s a lot of weight to lug around on a daily basis.

These locks, on the other hand, are extremely safe. They’re all Sold Secure Gold, with two exceptions. With a 3/5 from ART, they’re on the higher end of the Gold scale.

However, they can still be cropped! A thief with a large set of bolt croppers and the ability to leverage the ground can easily cut this chain lock.

So, when locking your bike, I would still recommend keeping the 10 mm chains tightly wrapped around the top tube. Also, secure your wheels using one of the alternative methods.

The Hiplok [Amazon] is a good choice once again. It’s easier to carry than the other options because it can be worn around the waist like a belt.

Hiplok Gold is only 12 mm thick, but it’s still very portable!

However, keep in mind that it’s still quite heavy: it’s the equivalent of carrying six cans of coke around your waist! Read my complete, hands-on Hiplok Gold bike chain lock review.

What about the other chains that are 10 mm in diameter?

Kryptonite’s Key Safe program will replace any keys that have been lost or broken. Optional anti-theft protection is available for Kryptonite chains on bikes worth up to $2,250 / £1000.

The LockPickingLaywer’s preferred lock in Evolution Series 4!

Abus locks do not have anti-theft protection, but they do come with a code card for extra or replacement keys.

Granit CityChain X-Plus has an excellent weight-to-security ratio.

And if I had to choose between the Hiplok, Kryptonite, or Abus chains, I’d go with the Hiplok, Kryptonite, or Abus, because the OnGuard 10 mm chains are a strange prospect…

The 8020 and 8021 Mastiff chains (both with an integrated lock) are two different lengths of the same chain. Both locks are only rated Sold Secure Bronze, despite the beefy 10 mm chains!

I wouldn’t recommend any bike locks with a Bronze rating, especially heavy 10 mm chain locks that are expensive and heavy! As a result, they have a low level of security. In my review of the OnGuard Mastiff 8020, I go into greater detail about this.

A 10 mm chain with a Bronze Sold Secure rating?

But, in the end, stay away from the OnGuard Mastiff 8020 and 8021!

The security levels of the OnGuard 8019 or 8019L Mastiff, on the other hand, are flawless. Both are Sold Secure Gold.

And I believe that an integrated lock is more convenient for mobile security, where you may be locking and unlocking your bike several times a day in crowded bike racks. They do, however, have their own padlocks.

When the lock is integrated into the chain rather than being separate, it is simply faster and easier to secure your bike.

So, if portability is important to you, the Hiplok Gold [Amazon] is by far the easiest chain lock to transport. However, because of the separate padlock, locking your bike will take a little longer.

If locking speed is important to you, choose the Kryptonite Evolution Series 4 1055 Mini [Amazon] or the Abus Granit CityChain X-Plus 1060/85 [Amazon], as both have integrated locks.

If you’re interested in learning more, check out my reviews of the Hiplok Gold and Kryptonite Evolution chain locks.

Is it possible to have a chain lock for both the street and the house?

These locks can be used for both stationary and mobile security. They’re also difficult to use at home if they’re too short. However, I believe that they must be short in order to be portable.

So proceed with caution if that’s what you’re after…

Chain locks, 12 mm

These are large and heavy locks… We’ve reached the limit of what can be used as mobile security on a daily basis at 12 mm.

To check prices at Amazon (or other retailers), click on the links in the table.



the amount of weight

Ratings for security

1275 Kryptonite New York Noose

75 cm (30″)

3.15 kg/6.95 lb

New York Chain Kryptonite 1210

(100 cm) 39″

3.92 kg (8.65 lb)

59/110 Abus Granit Extreme Plus

(110 cm) 43″

4 kg (8.82 lb)

8017Beast OnGuard

(110 cm) 43″

4.17 kg (9.2 lb)

1213 Kryptonite New York Noose

130 cm (51″)

4.79 kg/10.55 lb

59/140 Abus Granit Extreme Plus

140 cm/55″

4.7 kg/10.36 lb

Homie Hiplok

60″ (150 cm) x 60″ (150 cm) x 60″ (

9.48 pound (4.3 kg)

59/170 Abus Granit Extreme Plus

170 cm/67″

5.7 kg (12.57 lb)

New York Chain Kryptonite 1217

170 cm/67″

5.96 kg/13.15 lb

OnGuard 8018Beast is a beast from OnGuard.

72″(183 cm) x 72″(183 cm) x 72″(

13.7 pound (6.2 kg)

They do, however, offer a high level of security. Take a look at the ratings for security. Not only are they nearly all Sold Secure Gold, but they’re all rated 4/5 by ART.

They’re more secure than all but the most extreme u-locks because of this.

That isn’t to say they can’t be cropped! With a pair of 42″ bolt croppers and the ground as leverage, a thief could likely cut all of these chain locks.

Personally, I think you should keep them wrapped around the top tube. Keep them as far away from the ground as possible, even with these thick chains.

With a 12 mm chain, however, you don’t have to be as cautious. There aren’t many thieves with the right croppers, the necessary skill, and sufficient weight(!) to cut a 12 mm chain lock.

One end of the chain has a large, circular link. The best 12 mm chain lock is the Kryptonite New York Noose [Amazon]. You can create a noose by threading the other end of the chain through the circular link and tightening it around whatever you’re locking your bike to.

You get more length with the noose system.

What makes this so special? Well, it nearly doubles the chain lock’s practical length, which means you won’t need to buy one that’s as long, saving you both bulk and weight!

It’s also more useful as a stationary lock at home, where you’ll usually need a little more length to work with.

In my review of the Kryptonite new York Noose 1275 chain lock, I go over all of this in greater detail.

The longer locks are best used for stationary security at home (or wherever you leave your bike overnight) because even the shortest 12 mm locks are at the limit of what is portable.

It’s a nice 60″ (150 cm) long, so you can secure multiple bikes at once. In fact, the Hiplok Homie [Amazon] chain lock is designed specifically for home use.

When not in use, the Hiplok Homie has a hook to hang it on the wall.

It also includes an integrated hook so you can hang it on the wall when not in use!

What about the remaining choices on this list?

Abus classifies the Abus Granit Extreme Plus chain lock as a motorcycle lock, giving it a maximum 20/20 in-house security rating. It has an integrated lock for convenience.

A separate disc lock with a 14 mm, double locking shackle is included with the Kryptonite New York chain lock. Optional anti-theft protection is available for bikes up to $3,500 / £1300.

OnGuard’s Beast 8017 (and 8018) uses a separate padlock with a double-locking shackle of 11 mm. The shackle is also shrouded, making it impossible to crop when used with the chain (due to its inaccessibility).

But don’t be concerned (unless your insurance policy requires a Gold-rated lock)… Sold Secure and ART have not given these OnGuard locks a rating.

This isn’t to say that these two locks aren’t safe. It’s just that they haven’t been rated yet. Without a doubt, these OnGuard chains are extremely safe locks!

If used correctly, any of these 12 mm locks will provide excellent high security protection at home or on the go. However, if you plan to use them as mobile protection, make sure you’re comfortable with the weight first!

Choosing a chain lock that is stationary

We don’t need to worry about the “risk level” questions if we’re choosing a chain lock to leave at home (or wherever we leave our bikes overnight)…

Over half of all stolen bicycles are taken from the owner’s residence. As a result, your bike is in danger at home more than it is when it is locked on the street.

In light of this, my recommendation is to invest in the most secure bike lock you can afford. This entails using the thickest chain lock you can find.

And the best part is that we don’t have to worry about how we’ll transport it!

Chain locks with a 14 mm diameter

These aren’t the kind of locks you take to the store with you. We’re no longer talking about mobile security when we get to 14 mm chains.

Because of their size and weight, you usually leave them wherever you lock your bike overnight.

To check prices at Amazon (or other retailers), click on the links in the table.



the amount of weight

Ratings for security

New York, New York, New York, New York, New York, New York, New York, New York, New York, New York, New York,

(100 cm) 39″

4.90 kg/10.80 lb

8016Beast OnGuard

(110 cm) 43″

6.71 kg (14.8 lb)

New York, New York, New York, New York, New York, New York, New York, New York, New York, New York, New York,

60″ (150 cm) x 60″ (150 cm) x 60″ (

6.92 kg/15.25 lb

8016LBeast OnGuard

72″(183 cm) x 72″(183 cm) x 72″(

9.98 kg (22 lb)

A 14 mm chain lock, on the other hand, could be taken out with you on occasion if you’re visiting a particularly high-risk area or leaving your bike unattended for an extended period of time.

These locks are extremely safe. Not only does the Kryptonite New York Fahgettaboudit have a Sold Secure Gold rating. It also has a Motorcycle Gold rating, which is even more difficult.

The largest bolt cutters might be able to cut 14 mm chains. However, it takes an experienced thief of considerable weight who can also position the chain correctly. That isn’t to say they can’t be cropped. They are capable of doing so.

So, once again, keep your chain as far away from the ground as possible. Installing a wall anchor rather than a floor anchor to use with the chain lock in a bike shed or garage might be the best option.

Between the Kryptonite and OnGuard chains, there isn’t much to choose from. Both of these locks are fantastic!

OnGuard Beast is a very secure and usually inexpensive security solution.

The New York Fahgettaboudit chains from Kryptonite feature a 15 mm double locking shackle, a maximum 10/10 in-house security rating, and Sold Secure Motorcycle and Bicycle Gold ratings. Plus, anti-theft protection is available for bikes worth up to $3,750 (£2000).

OnGuards Beast chains feature a 14 mm quadruple locking shackle, a maximum in-house security rating of 99/100, and optional anti-theft protection for bikes worth up to $5001.

Because they haven’t been submitted, OnGuards locks aren’t rated by Sold Secure.

They are, however, less pick resistant, and the after-sales service and anti-theft protection are less reliable. Typically, an OnGuard chain lock will be less expensive than a Kryptonite [Amazon] chain lock.

Chain locks with a 15 mm diameter

And that’s the Kryptonite New York Legend in its entirety… There is only one 15 mm chain lock that is widely available.

To check prices at Amazon (or other retailers), click on the links in the table.



the amount of weight

Ratings for security

New York Legend Chain 1590 Kryptonite

90 cm (36″)

4.31 kg (9.50 lb)

New York Legend Chain 1515 Kryptonite

60″ (150 cm) x 60″ (150 cm) x 60″ (

7.23 kg/15.95 lb

This chain lock could theoretically be cropped by the right thief in the right position with the biggest bolt cutters. But I’ve never heard of it happening in real life!

The fact that ART has given it a maximum of 5/5 stars says it all. This is one of the most powerful bicycle locks available.

Anti-theft protection is available for bikes worth up to $4500 / £2500. The lock has a shrouded 16 mm double locking shackle.

The most secure and widely available lock in New York is the New York Legend.

Read the rest of my New York Legend review. It is, in fact, the most secure bike chain available among the three major lock brands. This is a fantastically secure bicycle chain lock.

16-millimeter chain locks

Finally, with a diameter of 16 mm, manual bolt cutters can no longer crop these chains. Power tools are the only way to defeat them.



the amount of weight

Ratings for security

Series III Almax Immobiliser

700 cm x 28″

4.15 kg (9.15 lb)

Protector Against Pragmasis

(100 cm) 39″

5.5 kg (12.13 lb)

Protector Against Pragmasis

60″ (150 cm) x 60″ (150 cm) x 60″ (

7.75 kg (17.09 lb)

Series III Almax Immobiliser

60″ (150 cm) x 60″ (150 cm) x 60″ (

7.75 kg (17.09 lb)

Protector Against Pragmasis

200 cm/79″

10 kg (22.05 lb)

Series III Almax Immobiliser

200 cm/79″

10 kg (22.05 lb)

Protector Against Pragmasis

(250 cm) 98″

12.25 kg (27 lb)

Series III Almax Immobiliser

(250 cm) 98″

12.25 kg (27 lb)

They’re also quite heavy. They’re not only impossible to transport, but you’ll also have to be careful that their weight doesn’t damage your bike!

Bolt cropping is impossible with the 16 mm links, which are made of hardened boron steel. Pragmasis’ Protector line of bicycle chain locks is possibly the best on the market.

It comes with a Squire SS65CS Stronghold Lock with a shrouded shackle that can’t be bolt cropped!

Squire Stronghold Pragmasis Protector 16 mm

A thief will only be able to open this lock with power tools, which will take a long time and make a lot of noise!

It also includes the Squire SS65CS Stronghold Lock. It’s made of 16 mm hardened boron steel links as well. The Almax Immobiliser Series III is very similar to the Protector range, but it is slightly less expensive (although I’m not sure it’s available in the US).

Personally, I’d choose a Pragmasis chain lock due to their environmentally friendly policies. However, I understand that not everyone can afford to be so fussy!

Summary of the Best Chain Lock

Bicycle chain locks come in two varieties:

  1. those that are light enough to carry on your bike every day
  2. Those that are so heavy that they should only be used as stationary security

Chain Locks on Wheels

They’re a lot more substantial than u-locks. They do, however, have a number of advantages… For many people, even 12 mm will be too much. The links on portable chains are less than 13 mm thick.

For starters, you can secure your bike to a wider range of objects because they’re relatively long and flexible.

Second, they’re easier to transport because you can wrap them around your seat post or top bar.

Finally, they are not vulnerable to leverage attacks and are more difficult to cut with an angle grinder (due to the fact that the links move around as you try to cut them).

However, one significant security disadvantage is that the < 12 mm links that make up a portable chain lock can be easily cropped by manual bolt cutters (if they’re close to the floor).

As a result, if you choose a chain lock for portable security, I recommend wrapping the chain tightly around your top tube to secure your bike.    &n

This will keep it off the ground and make cropping a decent portable chain lock very difficult (if not impossible).

You’ll have to come up with a new way to protect your wheels, but there are plenty of options, and your bike will be safe!

If weight is an issue, a u-lock is probably the best option. Even the smallest portable chain lock is going to be quite heavy. However, please double-check the weights before purchasing.

You can also wear them around your waist, which is a convenient option. The Hiploks’ security to weight ratios are excellent.

The Kryptonite Keeper chain lock is a good choice for protection in extremely low-risk situations. The Kryptonite Kryptoloks or the (even more secure) Abus CityChains are better for medium risk.

If you’re in a high-risk situation, I’d recommend the Kryptonite New York Noose or the Gold Hiplok chain lock.

Chain Locks that are fixed in place

And there are several reasons why these are the best option for immobile, overnight security… The links in stationary chains are usually thicker than 13 mm.

First and foremost, there is security. They are resistant to bottle jacks and leverage attacks, are more difficult to attack with power tools (such as angle grinders), and cannot be cropped by manual bolt cutters if the links are thicker than 15 mm.

The most secure way to lock your bike is with 15 and 16 mm chains.

And, more than any other type of lock, chain locks work best with anchors. Second, there’s the issue of practicality. The best way to secure a bike at home, in a garage, or in a bike shed is to use a ground (or wall) anchor.

Because you may be securing more than one bike at a time at home, get a chain lock that is long enough to go around them all!

This is especially true when it comes to stationary chain locks, which can be used in a shed or garage, as well as with other bike storage options. Any bike lock, of course, is only as secure as its weakest link.

Make sure whatever you use to secure your bike is as strong as the chain lock. If you don’t have anything suitable, you should consider purchasing a good ground anchor. Also, make sure you know how to properly lock your bike.

If you buy a chain lock, remember to clean and lubricate it every few months to prevent it from jamming. I hope you found this page helpful in your search for the best chain lock for your bike.

Please let me know if you have any feedback or questions in the comments section below.

You will not be charged any additional fees. This page contains affiliate links, which means that if you click through and make a purchase, I may receive a small commission. More information can be found here.

Carl Ellis last updated this page on August 8, 2021.

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