From mud holes to rocky trails to hill climbs to desert treks, Dayco HPX ATV and UTV belts deliver unparalleled response. Constructed with extra-strong Aramid cord reinforcement and fiber-loaded polychloroprene compounding, this belt delivers the muscle and durability demanded by today's high performance engines and the high performance enthusiasts who drive them. Tested under severe field conditions, the Dayco HPX ATV belt has been proven to run cooler and to provide longer belt life than competitive belts. Detailed Specifications: Outside circumference (inches): 38.66. Top width (inches): 1.28.