Riding 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 tire's rolling resistance. The approximate 200 gram extra weight compared with the 'classic' Marathon is hardly noticeable in everyday use.
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