The Kryptonite Kryptolok Series 2 U-Lock is a complete solution, simply use the 4' cable to secure front wheel or accessories. The 13mm hardened performance steel shackle resists cutting and leverage attacks, while the reinforced hardened cross bar design provides increased protection. The anti-rattle bumpers reduce noise during transport, while the new transit Flexframe-U transportation system allows for versatile and easy transportation.