On the Radiance belts--same with the Syncrony and Brilliance-if the belt should break the dealer where you bought the vacuum from is supposed to replace it,free.These belts are multigroove kevlar fiber reinforced belts-have seen them on some types of power tools-in fact Partner rescue saws have similar belts-these are gas powered circular saws rescuemen use to cut thru roofs,walls,and car roofs to rescue accident and fire victims.Other tools use them-belt sanders.When I fixed tools breifly-NEVER had to replace such a belt.And some miter saws use these belts.Ones where the motor is behind the blade housing-not on the side.