Kryptonite Evolution Series 4 U-Lock with FlexFrame Bracket
Black/Orange 10.2 cm x 22.9 cm x 14 mm Dispatched in 1-2 days ID: 54214-149695
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Black/Orange 10.2 cm x 29.2 cm x 14 mm Dispatched in 1-2 days ID: 54214-168031
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Kryptonite Evolution Series 4 U-Lock with FlexFrame Bracket reviews verified by reevooReevoo

Ease of installation
Ease of use
Value for money
Overall rating
Scores 8.7 out of 10 based on 25 reviews
8 out of 10


penzance cwll GB
good length key only comes out when it is locked.
Reviewer left no comment
Confirmed purchase: 08 February 2017
Published on: 09 March 2017
10 out of 10


london GB
Very hard to break into
Effective deterrent if locked in sensible place
Very heavy
Confirmed purchase: 30 September 2015
Published on: 03 November 2015
8 out of 10


Leigh on sea GB
Great lock, bought 2, one normal and one long
1) the bike fixture sticks out to far, which reduces attachment points
2) buy the longer lock, gives more flexibility
Confirmed purchase: 01 September 2015
Published on: 09 October 2015

What are the delivery costs?

We offer Free UK Delivery on all orders.

Including: Channel Islands, Isle of Man, Isle of Wight, Northern Ireland, Scottish Highlands and Scottish Islands.

Standard delivery is normally 2 - 5 working days.

International delivery costs and delivery times vary for different countries. Please see here for more information.

Christmas delivery

For guaranteed Christmas delivery please order bikes before 11am, Tuesday 20th December and all other items before 11am, Wednesday 21st December. Guaranteed Christmas delivery applies to all items with the icon, please choose your option/size to see if the specific item you are after qualifies for Christmas delivery.

Kryptonite are so confident in the security of their Evolution Series 4 U-Lock, they offer an additional £1000 anti-theft protection alongside the Sold Secure Gold rating it carries. Find out more about Sold Secure product testing.

Designed to protect your bike in moderate to high crime areas, the Evolution Series 4 combines the brute strength of a hardened 14mm steel shackle with innovative solutions like the patented double deadbolt locking mechanism, ovalised cylinder and an offset key location to reduce the effectiveness of twisting and levering attacks on the lock.

What’s more, the Evolution Series 4 comes with a versatile Flex Frame mount with anti-rattle bumpers and a weatherproof vinyl coating, making it easy and hassle free to carry with your bike anywhere you go. You also get 3 keys, including one with a built in light to help you find your way around the lock in the dark.

Key features:

  • 14mm 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
  • The 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
  • For moderate to high crime areas
  • U-lock dimensions: 10.2cm x 29.2cm x 14mm

Kryptonite Evolution Series 4 U-Lock with FlexFrame Bracket

£49.99 SAVE 10%
SAVE £5.00
AVAILABILITY: Dispatched in 1-2 days (See all options)