Mastertrack M-TRAC CSD 295/75R22.5 146/143L H OVERVIEW Mastertrack s M-TRAC CSD is a commercial tire that s designed for use on the drive axle of medium-duty trucks and buses and features a special rubber compound that lowers rolling resistance to enhance fuel efficiency. Zigzag grooves and angled tread blocks remove rocks stones mud dirt water slush snow and other unwanted debris out of the tread for consistent traction and the M-TRAC CSD s four steel belt construction increases strength and durability for a higher load carrying capacity and longer tread life.