The Abus Key Combo 1640 cable lock is great for low-risk areas, or as a backup to a primary lock in sketchy 'hoods. We also use it as a backup for roof racks. The PVC-coated steel cable is 15mm thick and 2.5-feet long, enough to lock both your front wheel and the frame. You can set your own combination, but the really cool thing is you can use either a key OR the combination. So don't worry if you forget the combo, use the key or the original code can be recovered using the provided tool.