Schwalbe Marathon Winter Plus Tire - 700 x 35 Clincher Wire Black/Reflective Performance Line 240 Steel Studs. For a safer Journey. You have full control on icy roads with the Marathon Winter Plus. Even in tight bends and under violent braking everything remains under control. For puncture protection it now comes with a SmartGuard layer. The spikes work best on ice when running at minimum pressure while at maximum pressure the tires can be ridden on ice-free roads with minimal road noise.