The gamut p20 dual ring chain guide and bashguard builds off the success of the gamut p30 dual ring by becoming a great option for 29er bikes or just for some smaller gearing to help keep the legs fresh the p20 dual ring comes with gamuts proven p20 polycarbonate bashguard along with all available mounting types its smaller size also creates more ground clearance reducing the possibility of impacting the various objects the trail can throw at you