Ride365.com carries a large selection of dirtbike tire combos. The rear wheel of a dirt bike generally wears faster than the front wheel but eventually, the time comes when both tires require replacing. Depending on the terrain tires might last just a couple of good rides or they could last for months. Either way, replacing a set of dirt bike tires adds to the cost of ownership. And if you race, you will want to always keep a fresh set of tires on hand.