Registering Your Combination Kryptonite Support October 27, 2016 18:04 Updated You can register your combination right on our website...quick and easy. Visit Key/Combo Registration.If you change your combination don't forget to contact us to update your combination in our system. Related articles Forgot Combination What is my Product Family? Lock Maintenance Video Can I call the Customer Support Team? Do I need to register to participate? Comments 1 comment Sort by Date Votes Garciasanmiguel April 16, 2013 03:57 Please be informed that the Kryptonite Lock has a serial number 501088 and the spare key has the serial number SS67504 R 3. Please be informed that the spare key does not enter in the keyhole and I have not forced it. Your help is appreciated. Thank you 0 Article is closed for comments.