Ultimate protection between rim and tube for mountain and road. Flats can be caused by rim strips getting old and deforming into the spoke holes, creating a pressure point for the tube. Repeated flats on the inside of the tube against the rim may mean the strip needs replaced.Proven durable even at road pressuresFlats can be caused by rim strips getting old and deforming into the spoke holes, creating a pressure point for the tubeRepeated flats on the inside of the tube against the rim may mean strip needs to be replaced26\" (black)700c (red).