Only with a key number can a new key be created. This number can be found on the bicycle key itself. With the number on the lock it is not possible to create a new key. If there are no more suitable keys, the key number is sometimes stated on the purchase note of the bicycle or on the insurance policy, when the bicycle is insured. It may be that the bicycle dealer where the bike was purchased has stored the key number in his system.
If you cannot find a key number on the key itself, take a picture of the entire key and send it to firstname.lastname@example.org or via WhatsApp to 06-20649337. In most cases, we can use the photo to find out the key number and give advice on which key you can order.