Schwalbe marathon plus 20 bike tyre smartguard
Schwalbe marathon plus 20 bike tyre smartguardriding through broken glass the new marathon plus with smart guard makes it possible thanks to the highly flexible special rubber layer the revolutionary feature of this new puncture protection system is due to its super ball characteristics the smart guard special rubber protection belt is so flexible that it has no effect on rolling resistance in fact whereas traditional puncture protection systems increase a tires rolling resistance