Using this Kryptonite U - lock is easy. First, unlock it with one of the two stainless steel keys provided. Wrap the 4 - foot KryptoFlex double - looped cable around your front wheel or accessories and insert the shackle through them and into a fixed object like a bike rack. Then lock it up. When transporting, use the FlexFrame - U bracket to attach the lock to your bike. Remember to keep the keys in a safe place. To maintain your lock, avoid exposing it to extreme weather conditions. If it gets dirty, clean it gently with a soft cloth. Check the keys and the lock mechanism regularly to make sure they're working properly.