Schwalbe ice spiker pro evolution winter mtb tyrelighter grippier faster the turbo of spike tyres with 361 spikes it bites firmly into icy roads the tungsten carbide core of each spike is clad in weight saving aluminium 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 braking featuressize 26 x 21026 x 235etrto 54 55960 559version tl readycompound winter 361 spksbar 2 0 4 01 6 3