The serial number is a unique identifier of a bicycle and it is critical to use it to your advantage. So, how do you get all of this information back after losing it ? Where To Find Your Bicycles Serial Number Not having your bicycle’s serial number or model name & year could prevent you from claiming the manufacturer’s warranty. Almost all bicycles come with warranty periods, however some manufacturers require that customers provide certain details about their bicycle before delivering on the product’s warranty. If your new bicycle develops a fault early into its purchase, it’s best to contact the manufacturer for repairs instead of taking it to a local mechanic. We’ll also cover ways in which riders can discover the make, model and serial number of their bike, even if its from the ’60s. How do you find your bike’s model year? What is a bicycle serial number and how does it even work? Well, in this article, we’ll discuss what a frame number is and how you can find it.