Schwalbe Marathon Winter Plus Tire 26''x1.75 Wire Clincher Winter SmartGuard 67TPI BlackFull control for icy roads. SmartGuard casing provides best puncture protection in icy conditions and low pressure. Lamella tread and 240 spikes provide grip even under high energy braking or tight turns. For best grip in icy conditions, use minimum pressure. On ice free roads, higher pressure will reduce road noise. *Note, new studded tires require a "bed in period." Tires should be run in for approx. 40km (25 miles) on asphalt without heavy