Panaracer R-Air Lightweight Tube At only 65g each, Panaracers r-air ultralight innertubes weigh less than many latex tubes. Produced with a special Butyl compound, they do not lose air and do not sacrifice puncture resistance. The R'Air tube gives you all the ride advantages of latex with all the functionality of butyl. Patch it with a regular butyl patch kit. Try a set on you bicycle to understand why the feel and ride of latex rules. Ridden by the Pro Tour Milram team during the 2006 season.