Wire bead with a more robust 60 TPI casing, the practice-grade OS20 PowerBlock has all the same tread and rubber features as the S-Spec version.Application:Race

Application:Race
Material:
60 TPI casing
UTC Rubber Compound
Wire Bead

Weight:
OS20 x 1.85 : 15.17oz; 430g
OS20 x 1.60 : 12.27oz; 348g