ATV BELT XTX, DAYCO XTX. Dayco XTX (Extreme Torque) ATV Belts are engineered for monster machines powered by 800cc and above engines. The specially-formulated high temperature polycloroprene rubber, with the highest level of aramid fiber loading available, delivers track churning performance for the most aggressive riders. An innovative breakthrough design features deeper cogs on top and rounded cogs on the bottom for ultimate flexibility and longer belt life. The Dayco XTX belt offers quicker, more consistent throttle response and reduced slippage during the highest levels of torque. This XTX belt is another Dayco product proudly made in the USA.