Maxxis Gypsy SW/B2B Tire Max Gypsy 700x38 Bk Wire/60 Sw/b2b Smooth overall profile provide a durable yet comfortable ride with low rolling resistance and excellent traction due to it`s directional tread and heavy siping B2B - 2 ply nylon breaker beneath the tread surface made for road tires EBIKE - has achieved a passing rating for use with E-Bikes up to 28mph and is ECE-R75 approved SW - SilkWorm increases puncture and tear resistance with a reinforced breaker beneath the tread surface DC - Dual Compound tread provides a lower rolling resistance center paired with extra grip for the corners