If you look after a treadmill properly and treat it with care, it can last for many years without needing to be repaired or replaced at all. Good quality treadmills like the MaxKare Folding Treadmill can last for a decade or more with proper care, but if the belt begins to get dirty, dusty, or worn out over time, you don't necessarily need to replace the entire treadmill. It is possible to replace a treadmill belt, and the first thing to do is check if your treadmill is under warranty. If so, the manufacturer should cover the costs of any new belt. If not, you may have to order a new belt from the manufacturer or elsewhere and then fit it yourself or seek out the services of a professional to fit it for you. Clean the belt regularly to extend its lifespan and check it often for fraying edges.