Schwalbe Marathon Winter 26 x 1.75 Wire Clincher Studded Race Guard Tire, Black, 26" x 2/3 Schwalbe, Marathon Winter, 26x1.75, Wire, Clincher, Studded, Race Guard, 67TPI, 30-70PSI, Black Spikes work best on ice at the minimum pressure T max pressure, noise is reduced to a minimum on ice-free roads