Bicycle inner tube for mountain bike, from America's respected bicycle inner tube specialist, Biketube Brand. Super Saver Bulk Pack of 4 tubes, plus one elastic, abrasion-resistant TubeSock (patent pending) to keep your tubes compact and safe until you need them. A $4.80 value! Free Biketube sticker with every order. Presta valves: 48mm-long threaded brass, non-removable core. Schrader valves: 35mm-long brass. Every Biketube Brand inner tube is individually tested for 24 hours, and dusted with talc to facilitate installation. 26" tubes approx. 200 g. ea. 27.5" tubes approx. 230 g. ea. 29x2.1-2.4" tubes approx. 240 g. ea.