You can have a rider placed on any valuable item. In the case of a bike, you show proof of value through a receipt. If it's something like jewelry, you need to get an appraisal. Once you show proof of value, if the item gets stolen, you get the amount of the rider in the form of a payment.

Riders aren't subject to depreciation like car insurance, generally, because you're buying a set amount of coverage that comes with a certain premium. Technically speaking, life insurance is a rider. It's important to read your homeowners policy, but it's very common for personal property to have a maximum payout of around $1,500 on a given item. If you've got an expensive ride, that won't even come close to replacing it.