Race face narrow wide single chainringrace face narrow wide single chainring is now improved with performance enhancing chain retention technology manufactured from t6 7075 aluminium for superb strength and durability the narrow wide single chainring is burly enough for downhill racers and dirt jumpers yet light enough for cross country and singlespeed riders read the bikeradar verdict here excellent xx1 like chain security for standard cranksif youre going to buy a new single r