Dayco Ultimax XS Belt is a new generation today's high horsepower machines can out-perform yesterday's drive belts. The Ultimax tradition of quality and innovation continues with the new Ultimax XS. It's the belt you've been waiting for to deliver peak performance and dependability never before available. Precise manufacturing gives peak performance for almost a century, Carlisle has engineered and manufactured products for industry's most critical applications. This expertise helps us build Ultimax XS to precise tolerances. Cutting edge technology Ultimax XS has increased strength and is built with new heat tolerant materials. With a revolutionary new compound, extra strong Aramax cord, and new manufacturing processes, Ultimax XS will run cooler, longer and faster.