LARGE AND CONVENIENT One grab, one click and your bike is locked - with the reliable protection of an ABUS lock. 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 our frame lock 4750, which has been specially developed for wheels with a large wheel passage. Technology: - 21/64" steel shackle - The case, the shackle as well as supporting elements of the locking mechanism are made of special hardened steel - Extreme large aperture for extra wide tires - Closing mechanism for easy attachment of accessory to the lock body - The 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