Originally Posted by 55/Rad

I would write them a friendly letter identifying yourself as the owner of the bike and the image. Tell them you are really happy and proud that they chose to use it. But be clear that because they are a commercial entity and used it without gaining permission, you would like some recognition and possibly some compensation. Imply that you will accept some product in exchange to make it easy for them. Anything more than this and they'll just take it down and it will end there...unless you want to spend a ton in legal fees.

Good luck.

55/Rad
Former Copyright Infringer