ID is NOT required to ride a bike in most states. In fact, ID is not required for most things you do public. You are NOT required to carry ID with you when you walk outside your house. However, as stated above, if you don't have an ID with you while riding, you better not run any stop signs, because if you're caught, your chances of being arrested is bigger. However, most of the time, they just take a fingerprint if you don't have an ID.