The turbo of spike tires bites firmly into icy roads. The tungsten carbide core of each spike is clad in weight-saving aluminum. Raceguard belting is a synthesis of special india rubber and several layers of nylon fabric offers very effective protection against penetration punctures while minimizing penalties. LTSKN – LiteSkin – Light thin sidewalls. Advantages: Weight saving and reduced rolling resistance. RCGD – RaceGuard – A synthesis of special india rubber and several layers of nylon fabric offers very effective protection against penetration punctures while minimizing penalties