The OTR 63.7" Heavy Duty 6-Rib V-Belt, with Expertise Built In™, is designed specifically for power delivery. Experience extended life of your engine with reduced noise with this 6-ribbed v-belt. Your engine requires optimal durability to high under hood temperatures for the tension you need to power your vehicle. OTR heavy duty v-belts are here, built to last. OTR understands what it takes to repair and maintain Class 6-8 trucks, so they deliver solutions, making your job easier and more efficient. OTR warranties are comparable to or better than OE and top brands. All heavy duty truck parts offer the same form, function, and fit as the OE replacement parts. FleetPride is your First Click in Heavy Duty®.