Providing Expertise Built In , the OTR 51.1" Heavy Duty Serpentine Belt delivers by not only meeting, but exceeding OEM standards. The OTR v-belt's 1-rib profile ensures precise power transmission. Featuring durable EPDM rubber blend, this v-belt boast of an extended lifespan. Your engine requires optimal resilience 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 .