Race face narrowwide single chainring has a performance enhancing chain retention technology with narrow wide tooth profile to mirror the narrow wide links of the chain helping to prevent the chain falling off the chainring its burly enough with a stiff 4mm plate thickness and i beam construction for downhill racing and dirt jumping but made from 7075 t6 aluminium so it is light enough for xc and singlespeed race face narrowwide chainring is 104 bcd and comes in four different colours with