RELIABLE AND ROBUST Thanks to the PRO AMPARO 4750 frame lock, your bike is protected from casual theft in just a few movements. Frame locks offer you reliable basic protection for your bike. Attaching it to the frame keeps the lock within reach at all times. Well suited for quick stops, you don't need to hook it up. Thanks to its intuitive and practical locking function, your bike is locked in no time. If you want to increase protection, you can add a connecting chain to the frame lock. The PRO AMPARO 4750 has a locking mechanism for easy attachment of accessories. Decide for yourself whether you want the lock in the NR or R version. With frame locks that have an R in the product name, the key cannot be removed when the lock is open. It stays put and you don't have to stow it away when you ride your bike. Those who prefer to remove the key can choose the NR version.