Dayco XTX (Extreme Torque) ATV Belt. Introducing the most powerful belt built for the most extreme machines. Dayco's revolutionary new ATV belts are engineered for those monster machines powered by 800cc and above engines. Specially-formulated high temperature Neoprene with the highest level of Aramid fiber loading available delivers track-churning performance for the most aggressive riders.This innovative break-through design features deeper cogs on top and rounded cogs on the bottom for ultimate flexibility and longer belt life.