Originally Posted by MattP.
not if you are on a bike. you are not required to carry an ID to operate a bike. So no, if you are on a bike, they can not detain you for having no ID.
Doubt this helps, but here's what happens where I live: you are not required to carry an ID to operate a bike. But if you break the law the police may require you to identify yourself. At that point riding a bike has got nothing to do with it - your ID is required for other reasons. They may detain you until they are convinced you are who you claim to be.
--J