Schwalbe marathon winter tyre raceguardfor a safer journey you have full control on icy roads with this tyre even in tight bends and under violent braking everything remains under control the spikes work best on ice when running at minimum pressure whilst at maximum pressure the tyres can be ridden on ice free roads with minimal road noise in order to ensure that spikes are permanently fixed tyres should be run in for about 40km on asphalt while avoiding any fast acceleration or heavy br