The Rockstop 27.5in WIDE Rim Protector is built from Rockstop®; a tough, highly shock absorbing rubberised polymer designed to fit on your MTB rim and protect it from dings, and your tyre from most impact punctures and burping.The geometry of the cross bridges forces the Rockstop® edges against the tyre sidewall, so that if you hit a rock it\'s the shock absorbing meat in the tyre and rim sandwich, preventing pinch punctures and rim damage.The Rockstop 27.5in WIDE Rim Protector has been designed on a 40mm wide rim so it suits anything from 35mm - 45mm. It\'s easy to fit, you don\'t need any glue or any extra valves. Comes ready assembled.Rockstop 27.5in WIDE Rim Protector FeaturesFits 35mm - 45mm Rims.High shock absorbing rubberised polymerWeighs appx 250g per wheelColour: YellowManufactured in the UK