Rockstop is a tough highly shock absorbing rubberised polymer designed to fit on your MTB rim & protect it from dings & your tyre from most impact punctures & burping. The geometry of the cross bridges forces the Rockstop edges against the tyre sidewall so that if you hit a rock its the shock absorbing meat in the tyre & rim sandwich preventing pinch punctures & rim damage. Rockstop Rim Protector has been designed on a 30mm rim & will suit 23-34mm rims. Features & Benefits High shock absorbing rubberised polymer Weighs appx 250g per wheel Its easy to fit You dont need any glue You dont need any extra valves It comes ready assembled Manufactured in the UK Box Contents 1 x Rockstop Rim Protector Assembly guide Rockstop merch Some Cumbrian air!