The least expensive way to ditch 40 grams of rotating weight 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 wheel packed in talc for easier installation 48cm valve base prevents issues of valves tearing off smooth at the top for easi