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Kryptonite Evolution Series 4 Standard Lock with EZMount Bracket

by Kryptonite
3.9 out of 5 stars  See all reviews (68 customer reviews)

Available from these sellers.


  • Bicycle security for moderate to high crime areas, with a standard length shackle
  • 14 mm hardened Kryptonium steel shackle
  • Patented double deadbolt locking mechanism for extensive holding power
  • High security ovalised cylinder that makes this a sold secure gold lock
  • Reinforced sleeve over crossbar and cylinder provides enhanced security protection
  • Reinforced internal housing increases twisting leverage type attacks
  • Offset key location and overhead cam locking mechanism resists leverage attacks
  • Double deadbolt locking for extra strength against leverage attacks
  • Anti-Rattle bumpers keeps the shackle snug against the crossbar and prevent unnecessary noise
  • 3 keys, including 1 lighted
  • EZ-Mount bracket included
  • Rotating dustcover over cylinder protects from dirt & grime
  • Vinyl coated and weatherproof
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Product details

  • Product Dimensions: 2 x 10 x 30 cm ; 998 g
  • Boxed-product Weight: 1.7 Kg
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
    Find out more about our Delivery Rates and Returns Policy
  • Item model number: LK4100
  • ASIN: B000LPG3D2
  • Date first available at Amazon.co.uk: 26 Dec 2008
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (68 customer reviews)
  • Amazon Bestsellers Rank: 18,120 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Product Description

Manufacturer's Description

Tough cycle lock for moderate to high crime areas, 14 mm case-hardened Kryptonium steel shackle with drill resistant flat key locking mechanism and an ovalised reinforced barrel. Gold Sold Secure standard.

Product Description

  • Type: U-lock
  • Bracket diameter: 13 mm
  • Bracket weight: 100 mm
  • Bracket height: 225 mm
  • Keys: 3
  • Safety features: High safety cylinder lock
  • Protective systems: drilling protection
  • Material: hardened Kryptonium special steel
  • Holder: EZ-mount


Customer Reviews

Most Helpful Customer Reviews
31 of 31 people found the following review helpful
5.0 out of 5 stars Excellent Cycle Lock 27 Sep 2010
Amazon Verified Purchase
I had two cycles stolen within a week and wasn't going to let it happen again. My old locks weren't cheap but were simply cut off the cycle. So I thought I'd go with a Gold rated U lock this time. A previous reviewer had said that it took a fire crew 30 minutes with specialist equipment to remove her lock having lost the key! I therefore bought two of these locks for my replacement cycle. The lock is well made and the orange locking bar gives a suitable warning to would be thieves. I have managed to fix both lock holders on the seat down-tube, one above the other, both locks facing forward but at slightly different angles (the angle is adjustable). With this arrangement I can carry 2 of these locks on my cycle without fouling my feet as I pedal or the drinks holder on the front down-tube. I would recommend this lock as a serious security device. A decent lock is not cheap but it cost me more to replace my stolen bikes and they were insured!
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15 of 16 people found the following review helpful
4.0 out of 5 stars Strong, heavy, big 5 Sep 2009
By Drozd
Amazon Verified Purchase
The lock looks very strong, with an oversized diameter shackle and a oval section main body with central key location, the action locks both sides of the shackle "U" not just one like some models, the keys are high security not the tubular type which can be easily opend with a pen, one key of the 3 has a blue LED light built in, though the carrying bracket is well made I found the lock was too big to fit within the frame of my 19" framed MTB so is unlikely to fit most bikes. A note on the £1100 theft insurance you have to register the lock with kryptonite within 2 weeks and if your bike is stolen you have to send them the broken lock to claim!
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4 of 4 people found the following review helpful
5.0 out of 5 stars Great lock and no problems 7 Aug 2011
By Jimbob
I read up on this lock and a lot of reviews talked about it being too small, not fitting and keys breaking. To be honest I have not had any of those problems. I have not had any trouble locking my bike to stands and poles although it is a little fiddly and there is a technique but once you figure it out it is no problem apart from the shackle scratching the frame a bit, a bit of tape on the frame solves this.

As for fitting the bracket to the frame of the bike, again I do not know what all the fuss is about, yes it does not fit perfectly inside the frame but if you angle the bracket out a little it fits just fine. Personally I have the bracket on the top bar of the frame with the shackle pointing backwards along side the rear wheel and it is just fine. If in doubt just look at someone else with a d-lock and see how they managed it.

The breaking key issue was my main concern obviously but again a little research solved that question, I just asked someone in a bike shop who owns a Kryptonite lock about keys breaking and they said keys only really break because they stick a little when inserting and people force the key when it is not fully inserted. So as long as you make sure the key is inserted all the way in before turning you will be fine, and do not FORCE the key anything you force will break. If it sticks just play with it a bit and you will not have to get an angle grinder to cut the lock!

Hope this helps
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Most Recent Customer Reviews
4.0 out of 5 stars Good lock
I have this lock on my commuter bike for about 1.5 years by now. It still handles good and locks and unlocks fine. Read more
Published 1 month ago by Taipan
5.0 out of 5 stars EZee 'Calmer'
Solid, good quality.
Used in tandem with a good steel chain it makes you feel more secure.
Remember to ensure you insert the key 'right in' for smooth working.
Published 1 month ago by NPQH52
3.0 out of 5 stars Not enough...
It has done the job so far. But the real problem is its intolerance to weather.
The locking mechanism rusted after 2 months and from now I had to constantly use WD-40 to... Read more
Published 3 months ago by 2dvisio
4.0 out of 5 stars Secure, a bit impractical
This is the perspective of a London commuter:

This is a sturdy, secure lock that will be defeated only by a very bold thief with an angle-grinder. Read more
Published 4 months ago by Vassilis
5.0 out of 5 stars Beefy lock, bracket works just fine (don't believe the hype)
Pay no attention to the reviews complaining about the EZ-mount bracket. It's quite simple to attach and stays VERY securely mounted on the bike, and it allows the lock to be... Read more
Published 5 months ago by Mr Antony Johnston
5.0 out of 5 stars Best Sub £35 Shackle Out There...
I spent far too much time researching reviews & opinions of shackle locks in order to find the best value (yes, Im a bit of a tight-wad), most reliable and most secure one out... Read more
Published 6 months ago by IntensiveCareNurse
5.0 out of 5 stars great
No problems at all so far after a few months of use.
The key dosent stick or difficult to turn,its all pretty secure. Read more
Published 6 months ago by cjm
4.0 out of 5 stars Avoid
I read a few reviews about the internals of the lock easily rusting and I thought it can't be a big problem as there are only a few of these. Read more
Published 7 months ago by AnonymousPenguin
5.0 out of 5 stars everyday for 6 months, still happy
I am very happy with my lock.
So far nobody tried to take my bike, and they are usually doing here where I live. Read more
Published 8 months ago by tovarna
2.0 out of 5 stars Heavy and Unreliable Locking Mechanism
I've owned this lock for about 6 months and I'm quite disappointed with it.

I bought it because I needed a gold sold secure lock to satisfy my bike insurance and whilst... Read more
Published 9 months ago by Huggybaby
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Discussion Replies Latest Post
could anyone write U-lock dimensions of this lock please? 1 26 Jul 2010
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