At only 65g each approx 50 lighter than a regular road tube panaracer39s r air ultralight innertubes weigh less than many latex tubes they are produced with a special butyl compound so unlike latex or other manufacturer39s quotlightweightquot tubes r air tubes do not lose air and do not sacrifice puncture resistance available in 3 valve lengths for suitability with various top end wheelsets for the weight conscious roadie