Challenge superlite cross latex cx tubelatex inner tubes used in all high end tubular thanks to their low rolling resistance thinner and more flexible than butyl tubes the use in open tubulars increases comfort and lowers rolling resistance latex is also more resistant to punctures on the other hand it is a porous material therefore it requires daily inflation features use tubular tyres valve presta removable core valve length 47 5mm weight 85gbuy challenge wheels tyresfrom chain rea