Michelin c2 airstop butyl mtb bike tube the airstop butyl tubes are an economical long lasting tube with good puncture resistance 09mm wall thickness for optimum puncture protection and also the butyl tubes provide better resistance to friction caused by spokes and old rim tapefeatures26x1 0 15 or 11 15 valve presta french and schrader standard 40mm presta or 36mm schrader weight 128g approxbuymichelin wheels tyresfrom chain reaction cycles the worlds largest online bik