tac 9 2 pack money saver - thorn resist tube, 26" x 1.95-2.35 32mm schrader valve, mountain bike, cruiser, mtb, mtn bicycles replacement tube puncture resistent tac 9 tac 9 thorn resist tube, 26" x 1.95-2.35 32mm schrader valve. a thorn resistant bicycle inner tube that is 7 times thicker than a standard inner tube. our bicycle inner tubes are manufactured with high quality butyl rubber. it provides more resistence from puncture that could be caused by objects such as a thorn, sticker, sand burr or goat head sticker. it's thickness also provides extra protection from the spoke nipples on the rim. it's imperative you maintain proper air pressure with this thicker and heavier tube. see tire manufacturers minimum and maximum pressures on the side of the tire.our tubes are specifically engineered with a reinforced valve stem to prevent tearing or breaking. each tube is quality control inspected at the factory.