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  • Description
  • Reviews (58)
  • Bike Locks Guide
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  • Product description

    The Kryptonite Evolution Series 4 U-Lock is a true deterrent for any thief, so you can be sure your bike is safe - whether you're at work, shopping or at home. Sold Secure Gold with £1,000 anti-theft protection this bike lock provides the highest level of security for moderate to high crime areas.

    The patented double deadbolt locking mechanism has extensive holding power, while the reinforced internal housing has incredible resistance against twisting or leverage style attacks.

    Anti rattle bumpers will prevent scratches to your precious bike frame, and the Evolution Series 4 itself weighs surprisingly less than you might expect from such a sturdy lock. It's definitely light enough for you to put in your pack. The Kryptonite Evolution Series 4 U-Lock should be on every cyclists wish list.

    Weight - 1.8kg (includes keys & fittings)

    Features

    • 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 resistance to twisting and 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
    • The Transit FlexFrame-U mounts quickly and easily and supports the transportation of the most common u-lock sizes
    • The Flex Frame-U fits bicycle frame tubing 25mm to 80mm whether round, oval, triangular or square shapes
    • Included mounting system allows for 360 degree rotation providing the ability to micro-adjust the lock angle to better fit and align with a bike frames specific geometry
    • Rotating dustcover over cylinder protects from dirt & grime
    • Vinyl coated and weatherproof
    • U-lock dimensions: 10.2 cm x 29.2 cm x 14 mm

  • Kryptonite Evolution Series 4 U-Lock with FlexFrame Bracket Reviews

    Write your own review
    Overall Rating:
    4.7
    out of 5
    4.73
    Build Quality
    4.72
    Performance
    5
    Value For Money
    4.70

    Customer Reviews (58)

    4
    Extremely Good

    Vast improvement over similar locks from about 10 years ago very easy to use and seems far more secure. Glad I updated my lock - like so many other things old is not always the best!

    Vast improvement over similar locks from about 10 years ago very easy to use and seems far more secure. Glad I updated my lock - like so many other things old is not always the best!

    Close review
    4.5 out of 5
    Build Quality: 4.5/5
    Performance: 5/5
    Value For Money: 4/5
    5
    I'd say theft proof

    This is a really heavy duty lock which makes breaking it for any would-be theif, almost impossible. It has three keys and one has a light so great when you are fumbling in the dark to unlock your bike. There is even a clip on it which means you can attach it directly to your bike but I haven't tried that. The only small gripe I have is that it is quite heavy but I guess it needs to be.

    This is a really heavy duty lock which makes breaking it for any would-be theif, almost impossible. It has three keys and one has a light so great when you are fumbling in the dark to unlock your bike. There is even a clip on it which means you can attach it directly to your bike but I haven't tried that. The only small gripe I have is that it is quite heavy but I guess it needs to be.

    Close review
    4.8 out of 5
    Build Quality: 5/5
    Performance: 4.5/5
    Value For Money: 5/5
    5
    Great Lock

    A good solid lock, the longer length is handy at times to get round the bike and the fixed object... by far the most solid lock I have had. Very pleased. However with an "E-bike" it is a job to find space for the carrying bracket, if I bought the smaller model I would need to carry a cable with it as bike stands etc are thin on the ground here.

    A good solid lock, the longer length is handy at times to get round the bike and the fixed object... by far the most solid lock I have had. Very pleased. However with an "E-bike" it is a job to find space for the carrying bracket, if I bought the smaller model I would need to carry a cable with it as bike stands etc are thin on the ground here.

    Close review
    5 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 5/5
    5
    Looks very sturdy

    Looks like a very good quality lock. It is very big (there is no way I can mount it ANYWHERE on my Cannondale Quick 6) Will leave it as a spare lock to take it in my rucksack when I need to leave my bike outside for a long period. Will get a mini lock for my commuting needs. The up to £1000 guarantee what Kryptonite offers is a great bonus!

    Looks like a very good quality lock. It is very big (there is no way I can mount it ANYWHERE on my Cannondale Quick 6) Will leave it as a spare lock to take it in my rucksack when I need to leave my bike outside for a long period. Will get a mini lock for my commuting needs. The up to £1000 guarantee what Kryptonite offers is a great bonus!

    Close review
    5 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 5/5
    4
    Good lock

    Upgraded to this lock. Good features: 3 keys and one with a little light, together with free replacement lock. Also it has a handy frame attachment. It is very sturdy and only criticism is that it is a bit heavy.

    Upgraded to this lock. Good features: 3 keys and one with a little light, together with free replacement lock. Also it has a handy frame attachment. It is very sturdy and only criticism is that it is a bit heavy.

    Close review
    4.2 out of 5
    Build Quality: 5/5
    Performance: 4.5/5
    Value For Money: 3/5
    5
    Quality lock, great price

    I originally ordered the longer lock but decided to swap it for the shorter one when it arrived as the longer one is a bit excessive just for locking a standard frame to a bar or pole. It's fairly heavy but comes with a bracket to attach it to your bike. Luckily not had the chance to discover if its sturdy but it feels v sturdy and allows me to lock up the bike with confidence, especially with the shorter version as it leaves little room for leverage.

    I originally ordered the longer lock but decided to swap it for the shorter one when it arrived as the longer one is a bit excessive just for locking a standard frame to a bar or pole. It's fairly heavy but comes with a bracket to attach it to your bike. Luckily not had the chance to discover if its sturdy but it feels v sturdy and allows me to lock up the bike with confidence, especially with the shorter version as it leaves little room for leverage.

    Close review
    5 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 5/5
    5
    Solid and good value

    Bought the longer of the two locks. (29.2cm) Quite heavy and solid. Would suggest a squirt of oil / WD40 into keyhole before use. 3 keys provided one with a key light. Have not used the bike bracket as use these in my garage through a wall bracket. Needed the longer version for this.

    Bought the longer of the two locks. (29.2cm) Quite heavy and solid. Would suggest a squirt of oil / WD40 into keyhole before use. 3 keys provided one with a key light. Have not used the bike bracket as use these in my garage through a wall bracket. Needed the longer version for this.

    Close review
    5 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 5/5
    5
    Solid lock

    I bought two of these locks on the advice of a friend who lives in Hackney and his bike is locked up outside his flat most nights and it has stood the attempts of a few would be theives. I must say I was delighted by the solid quality of them, not had a chance to use them yet, but feel secure in the knowledge my our bikes are safe.

    I bought two of these locks on the advice of a friend who lives in Hackney and his bike is locked up outside his flat most nights and it has stood the attempts of a few would be theives. I must say I was delighted by the solid quality of them, not had a chance to use them yet, but feel secure in the knowledge my our bikes are safe.

    Close review
    5 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 5/5
    5
    solid lock

    With stands heavy duty bolt cutters. A must have :)

    With stands heavy duty bolt cutters. A must have :)

    Close review
    4.8 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 4.5/5
    5
    Good solid lock - weight no issue in a backpack

    Came quickly with next day delivery (but on my next order of helmet + shorts I had to wait a long time as the website showed stock was present when it was actually not in stock - something to be aware of if you need something urgently. Victims of there own success as the website does not update quickly enough with demand). Not using the bracket, I just pop the lock in my backpack and have no problems with the weight. Hardly feel it's there and its a quality lock. I ordered the longer version to give me a bit more flexibility. Excellent price from Tredz. I would buy again. No issues with key sticking as yet - there are clear instructions that you have to insert the key fully before attempting to turn. Oiling also recommended with a squirt of WD40 once in a while.

    Came quickly with next day delivery (but on my next order of helmet + shorts I had to wait a long time as the website showed stock was present when it was actually not in stock - something to be aware of if you need something urgently. Victims of there own success as the website does not update quickly enough with demand). Not using the bracket, I just pop the lock in my backpack and have no problems with the weight. Hardly feel it's there and its a quality lock. I ordered the longer version to give me a bit more flexibility. Excellent price from Tredz. I would buy again. No issues with key sticking as yet - there are clear instructions that you have to insert the key fully before attempting to turn. Oiling also recommended with a squirt of WD40 once in a while.

    Close review
    5 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 5/5
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