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Kryptonite Kryptolok LS Bike U-Lock, Heavy Duty Anti-Theft Bicycle Lock Sold Secure Gold, 12.7mm Long Shackle with Mounting Bracket and Keys, Ultimate Security Lock for Bicycles E-Bikes Scooters

4.4 4.4 out of 5 stars 737 ratings

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Available at a lower price from other sellers that may not offer free Prime shipping.
New-u 2017

Purchase options and add-ons

Brand Kryptonite
Special Feature Anti-theft
Lock Type Key Lock
Item Dimensions LxWxH 3.15 x 1.18 x 1.18 inches
Material Alloy Steel

About this item

  • 12.7mm Hardended Performance Steel Shackle Resists Hand Tools, Bolt Cutters, and Leverage Attacks
  • Interior Locking Dimensions; 4" x 11.5"
  • Key Safe Program; Kryptonite will ship your first 2 keys for free, globally, in the event you lose them.
  • Anti-Theft Protection Offer; Up to $1,750 Reimbursement

Frequently bought together

$49.24
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From the manufacturer


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  • Rated 6/10 on Kryptonite's security scale
  • Moderate security lock
  • Eligible for the optional Anti-theft Protection

KryptoLok LS U-Lock

Moderate Security

  • 12.7mm hardened performance steel shackle.
  • Includes 2 stainless steel keys, with ergonomic design to reduce the amount of torque, and keep them from bending or breaking.
  • New "pass-thru" crossbar design includes enhanced anti-rotation features, providing advanced protection against twist and single cut style attacks.
  • New hardened double-deadbolts engage both shackle ends increasing holding power.
  • New dust cover.
  • High security disc-style cylinder is pick and drill resistant.
  • Includes flexframe-u bracket providing convenient multi-location u-lock transport.
  • Dimensions: 4" x 11.5" (10.2cm x 29.2cm) - Weight: 3.25 lbs (1.47 kg's)

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Shackle Size

12.7mm performance steel shackle with new hardened double-deadbolts to engage both ends increasing holding power.

Anti-theft Protection

Register your product online to activate the optional Anti-theft Protection. In the unlikely event the product is defeated when used properly Kryptonite will pay out up to a certain value depending on the security value of the product. Visit our official website for further information. T&C’s apply.

Key Safe Program

Register your keys online and Kryptonite will ship you 2 keys, globally, in the event you lose them.

Stainless Steel Keys

2 stainless steel keys with ergonomic design to reduce the amount of torque.

Product information

Technical Details

Additional Information

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Kryptonite

Kryptonite Kryptolok LS Bike U-Lock, Heavy Duty Anti-Theft Bicycle Lock Sold Secure Gold, 12.7mm Long Shackle with Mounting Bracket and Keys, Ultimate Security Lock for Bicycles E-Bikes Scooters


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Customer reviews

4.4 out of 5 stars
4.4 out of 5
737 global ratings

Customers say

Customers like the performance and value of the lock. For example, they say it works well, is durable, and effective. Customers are also impresseded with the kryptonite. That said, some complain that the fit is poor and the bracket slips loose. Opinions are mixed on quality, size, mounting, and weight.

AI-generated from the text of customer reviews

31 customers mention22 positive9 negative

Customers like the performance of the lock. For example, they say it's durable, effective, and works well so far. Some mention that it works great for parking meters and that it'll keep anyone from entering their yard. Overall, most are satisfied with the performance and functionality of the product.

"...lock to lock the two handles of my shed together and it works perfect for the job at hand...." Read more

"This lock is heavy, monstrously large, and does its job...." Read more

"...The MOUNTING BRACKETOh dear. This is really terrible. Before buying this, look on YouTube! Essential viewing...." Read more

"Very good, strong lock. The attachment to the bike seems a bit lower in quality than the lock, but it's OK...." Read more

20 customers mention20 positive0 negative

Customers appreciate the value of the lock. They say it is a good investment and a quality lock at a reasonable price.

"...all and all this is a good bargain for the price without going with your more expensive and heavier alternatives considering the length of the..." Read more

"...the shed and there are other layers of security in place , but the price is right and so is the quality of the product." Read more

"Great value" Read more

"...Not cheap, but reasonably priced. This one in particular is extra long, about two inches longer than most U-locks...." Read more

8 customers mention8 positive0 negative

Customers are satisfied with the kryptonite lock. They mention that it's easy to use, keeps their expensive bikes safe, and is the best theft deterrent. The lock is very heavy duty, which makes it more effective for pesky thieves trying to steal a bike.

"...I've mounted it on my bike and it's already helped keep my bike safe and secure around town...." Read more

"The lock is very heavy duty and should work well to protect my bike...." Read more

"...The lock is definitely on a heavier side, which makes it more effective for the pesky thieves trying to steal a bike...." Read more

"...It is heavy duty, secure, and nobody is going to steal this bike. The only reason for four stars is because personally it is a little too big...." Read more

143 customers mention96 positive47 negative

Customers are mixed about the quality of the lock. Some mention it's the most reliable lock available on the market, it'll last a long time, and it'd be the best lock you can buy. However, others say that the locking mechanism can be less than perfect at times, the cylinder can be a little finicky, and the lock will spin outward.

"...Compared to the old system I had she was delighted in the ease of use, when you unlock it, it can only be out together one way or it will not work...." Read more

"...Overall, this is a solid lock though, and I don't think I have to worry about anyone snagging my bike while I have it engaged, which is really the..." Read more

"...Definitely, a great lock because it's strong and secure, attaches well to the bike itself, and it's a long enough U-bar that you might be able to..." Read more

"While this seems to be a sturdy lock the locking mechanism and key do not work smoothly and are very difficult to lock together...." Read more

46 customers mention28 positive18 negative

Customers are mixed about the size of the lock. Some mention it's great and big enough to fit into awkward locking situations, while others say that it'll fit in their bike frame and next to a water bottle.

"...The length on the lock works great for this purpose.Areas of concern, but not a deal breaker as far as I'm concerned2...." Read more

"...The opening through the plastic guard piece for the key hole does seem a little small, so if the lighting is poor and I don't have my glasses on, I..." Read more

"This lock is longer and narrower than the original Kryptonites...." Read more

"...strong and secure, attaches well to the bike itself, and it's a long enough U-bar that you might be able to lock up two bikes instead of just one!..." Read more

19 customers mention6 positive13 negative

Customers are mixed about the mounting of the lock. Some mention that the mounting system is great, while others say that it's terrible and not reliable.

"...Also the bracket has to be mounted so there is room to be able to get the silver mount clip on the lock ahead of the bracket so you can then slide..." Read more

"...Definitely, a great lock because it's strong and secure, attaches well to the bike itself, and it's a long enough U-bar that you might be able to..." Read more

"...Since the mounting bracket is so useless, its next place of repose will be the municipal dump.A (qualified) 5 stars for the lock...." Read more

"...I found the mounting mechanism to be garbage though. It was still too loose, and banged the lock around on the frame of my bike as I rode...." Read more

15 customers mention5 positive10 negative

Customers are mixed about the weight of the lock. Some mention that it's a little heavy but extra sturdy, while others say that it extends in length. Some customers also mention that the lock is over 3 pounds in weight, bulky, and awkward to carry.

"...Cons-1. a bit heavy.... not a big deal.... there is no way of getting around this because of the length...." Read more

"This lock is heavy, monstrously large, and does its job...." Read more

"...The only other downside is the weight. It's heavy -- but that's because of the extra length...." Read more

"I can lock 2 bikes with this one lock. However, this lock is large, heavy, and cumbersome to carry...." Read more

17 customers mention0 positive17 negative

Customers are dissatisfied with the fit of the lock. They mention that the bracket slips loose, the key entrance sticks, and the lock flops around. The rubber O rings on the U bar constantly slide, making it difficult to grip the frame. One day, it suddenly became loose while they were riding their bike, causing the lock to stick off the frame by an inch and a half.

"...The keeper 2 was a great lock, despite the key sometimes being sticky, but the mount that came with the lock wouldn't fit on my bike well and wore..." Read more

"...air, WD-40 and banging on it near the key entrance, but it persists in sticking. The second, basically unused key, doesn’t seem to help...." Read more

"...It also vibrates while you are riding.PLEASE, Kryptonite, make a low profile bracket for this lock...." Read more

"...It will not stay put! It slides, and swings, and slips and cannot adequately grip the bike paintwork...." Read more

Good Price
5 Stars
Good Price
Obviously it’s the brand that’s king of U-Locks. But I bet it someone had a battery powered angle grinder they could get through this. Catalytic converter thieves usually carry those around but your typical minor criminal may not have electric tools to steal your bike and so these U-locks definitely do the job. The connector to the bike took some time for me to get it right and sturdily secured to the bike. I originally mounted it on the top but then I decided to get another lock to lock my front tire to the bike. These two pairs well together on the bone. If I had two slider connections there wouldn’t be enough time but this other u-lock swivels to connect to the mounting bracket and therefore doesn’t need extra room to attach to the bike. Just wish I could still have room for a water bottle but locks are more important for city biking.
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Top reviews from other countries

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María M.
5.0 out of 5 stars Es el segundo que compró y seguiría comprándolo
Reviewed in Mexico on January 17, 2024
Style: New-u 2017Verified Purchase
maureen floyd
5.0 out of 5 stars "As Advertised"
Reviewed in Canada on June 20, 2021
Style: New-u 2017Verified Purchase
Laurynas Aravicius
5.0 out of 5 stars Not a save lock
Reviewed in Germany on March 6, 2023
Style: New-u 2017Verified Purchase
Mr. D. Zamorano
5.0 out of 5 stars Sturdy.
Reviewed in the United Kingdom on December 7, 2021
Style: New-u 2017Verified Purchase
Impromptu
5.0 out of 5 stars Buena calidad y tamaño
Reviewed in Mexico on August 10, 2018