Kore stronghold direct mount chainringthis chainring allows usage of a 1x drivetrain setup on most 9 10 and 11 speed drivetrains the hooked tooth narrowwide design provides optimum chain retention without the need for using a chainguide the extra tall teeth combined with the tactically placed divots on the chainring surface aid mud shedding and help to clear any mud and dirt features material cnc machined 7075 t6 aluminium compatibilitysram direct mount speed910 and 11 speed bcd x