Schwalbe marathon plus road tyre smart guardschwalbes marathon plus tyre prides itself on being the only tyre in the world that deserves the label flat less featuring a bespoke patented five millimetres thick puncture protection belt made from highly elastic special rubber the schwalbe marathon plus road tyre smart guard resists thumbtacks glass and other sharp edged debris an advanced design offers a lighter roll for a comfortable smooth and safe ride racing and club cyclists c