The least expensive way to ditch 40 grams of rotating weight on road tubes patented oversized 48cm valve base prevents tearing partially threaded valve stem for cleaner interface with pumps our lightest and most supple tube offering the turbo ultralight tube with patented valve and valve base is proven in rolling resistance testing to reduce drag by as much as 13 per wheelpacked in talc for easier installation48cm valve base prevents issues of valves tearing offsmooth at the top for ea