• Kryptonite Evolution S4 U-Lock

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Kryptonite Evolution S4 U-Lock

As a leader in action sports security and the creator of the original bicycle u-lock in the bicycle security category in 1971, Kryptonite offers premium quality security products.


  • 14mm hardened MAX-Performance steel shackle resists cutting and leverage attacks.
  • Double deadbolt locking mechanism for extensive holding power.
  • New, higher security, disc-style cylinder with more than 1 million key variations.
  • Reinforced anti-drill/pull cylinder protection system.
  • Enhanced internal engineering resists twist attacks.
  • Center key location and dual overhead cam locking mechanism resists leverage attacks.
  • Sliding dustcover protects and extends cylinder life.
  • Includes versatile EZ Mount transportation bracket.
  • 3 keys - one lighted with high intensity bulb & replaceable battery.
  • Anti-rattle bumpers reduce noise during transport.

European Testing Agencies

  • In Europe, independent testing agencies put locks through their paces to see how secure they really are, or in some cases are not. Kryptonite holds more than 45 approvals at Sold Secure (UK), ART (NL), VdS (DE), N.F. (FRA), Classe SRA (FRA), SSF (Sweden) and VAREFAKTA (Den). These agencies attacked products with every bit of malice the testers could throw at them and they still held up.

Buy Kryptonite Accessories from Chain Reaction Cycles, the World's Largest Online Bike Store.

  • Delivery costFREE
  • Delivery toUSA
  • 365 Days return or exchange

    If you're not completely satisfied with an item you may return it within 12 months of purchase. We'll give you a full refund if the item hasn't been used or the component hasn’t been fitted.

    More information on returns
  • Pay by PayPal, Bank Transfer or Card


Buying Guide

  • We've got everything you need to know in our buying guide.