Frame locks are the basic protection of your bike. If you're just popping into the bakery, they are a convenient solution to protect your bike from quick theft in one easy step. Just like the frame lock 4750, which has been specially developed for wheels with a large wheel passage.Features:8.5 mm steel shackleThe case, the shackle as well as supporting elements of the locking mechanism are made of specially hardened steelExtreme large aperture for extra wide tiresThe closing mechanism for easy attachment of an accessory to the lock bodyThe R (key retaining) version holds the key when the lock is open, the NR (non-key retaining) version allows taking the key out of the cylinder