Schwalbe durano plus road tyre smartguardmaximum puncture protection for race machines the smartguard belt is not as deep as the marathon plus nevertheless it offers a unique level of protection for racing tyres this is the most puncture protected road bike tyre smartguardthe most efficient protection belt there is for bike tyres in other words flatless solid 5mm thick layer of highly flexible special rubber provides permanent protection even thumbtacks are no problem for this tyre fea