SerfasA(R) MEO Series Drifters give you speed and confidence to ride a variety of surfaces.Designed with a smart inverted tread pattern the SerfasA(R) MEO Series Drifter provides high performance handling and speed on road with less rolling resistance while boasting impressive versatility and grip on loose surfaces like dirt and gravel.Wire Bead - 30 TPI - Inverted Tread Design Features: Inverted Tread Design Low Rolling Resistance Allows Greater Straight-Line Speed 68 Durometer Center For Durability and Long Tread Life, 58 Durometer Outer Tread For Enhanced Cornering Grip Specs: Wire Bead 30 TPI