EBay provides a tool for calculating shipping costs based on the buyer's ZIP code; this calculation depends on the weight and dimensions of the tires, which the seller provides. However, many active sellers on eBay offer free shipping.
As of May 2015, the eBay shipping tool is available on a tab to the right of the Description tab. If the seller doesn't offer free shipping, it's important to determine the cost of shipping to avoid paying too much. Tires are heavy and bulky, which makes them expensive to ship. EBay also provides a tire-buying guide to help users purchase the correct tires for their cars, eliminating confusion and the hassle of returns.