For a safer Journey. You have full control on icy roads with the Marathon Winter Plus. Even in tight bends and under violent braking everythign remains under control. For best possible 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. Specifications: - Size: 55-406 (20 X 2.15) - Performance: SmartGuard - Compound: WinterTechnologies:Smartguard:- The safestpucture belt for bicycle tires. Unbeatable for more than 15 years. It has proven itself in practice more than any other tire. Only tires with SmartGuard are real flat-less tires. Available exclusively from Schwalbe. Performance Line:- Excellent quality for intensive use.- These are the best value for money tires.