The kryptonite ring lock the kryptonite ring lock is a premiumframe lock and has the option to link a plug in cable or chain to the lock so you can lock your bike to a fixed object breaking it open is almost impossible due to the extremely durable seamless welded connection a modern ergonomic design and is still slim and light kryptonite ring lock features a modern ergonomic design and is still slim and light has the option to link a plug in cable or chain to the lock so you can