XR RACE SERIES: Not recommended for OEM primary clutches. The XR Race Series Belts were developed specifically for race applications and high-powered cars that thrive on thrashing through the dunes or desert. Manufactured with a larger Kevlar cord and custom braid design marrying the belt layers for better shock absorption, increased cord pop-out resistance, and being able to withstand more heat for increased strength and durability. This belt has been load-tested to withstand the power of 600hp machines and is considered the strongest all-around CVT drive belt we offer.