Maxxis Presta Valve Welterweight Tube (29X1.9-2.35) Durable welterweight bicycle tire tubes Engineered for aggressive road riders who require durability in their inner tubes Middle-weight tubes are targeted to all disciplines of riding 0.9-millimeter-thick walls and a puncture-resistant design Includes limited manufacturer's warranty of the shorter of six months from date of purchase, or until there is no serviceable original tread depth remaining on tire