Gates T179RB Blue Racing Timing Belt Belts are precision ground, not cut, so they fit the pulley with absolute perfection 145 Teeth, .846 inch(22mm) top width, .315 inch(8mm) pitch, 45.669 inch(1160mm) pitch Length of stock belts Durable nylon fiber provides extra wear resistance, doubling tooth strength Aramid reinforcement in a patented EPDM compound for three times the heat resistance and durability of standard belt Patented EPDM compound gives Gates Racing belts extended service life