Michelin c4 aircomp ultralight mtb tubes 6 pack our pack of 6 ultralight inner tubes means you save over buying the same tubes individually now professionals and amateurs alike can have the advantage of these remarkably light tubes which weigh only 155 grams features weight 155g one of the lightest mtb inner tubes available valve presta valve length 40mmsize 26 x 15 to 21 3754 560buy michelin wheels and tyres from chain reaction cycles the worlds largest online bike store