Michelin a2 airstop butyl road bike tubethe 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 tape features700x25c 32c etrto 2532 622635 valve presta french 40mmweight 125g approx buymichelin wheels tyresfrom chain reaction cycles the worlds largest online bike store