Please note new arrive RM30-32 holes black hub do not provide Quick Release Please note this is MTB hub, not road bike hub. it is for V brake only, not suits disc brake! 32holes and 36holes two specification If the hub can handle 8/9 speed, it can also handle 10 speed, the cassettes are the same width. the standard Shimano/SRAM freehub and the SRAM XD freehub of a mountain bike wheel are slightly narrower than on a road wheel, so a road bike cassette won’t fit on an MTB wheel and an MTB cassette needs a spacer to fit on a road bike freehub. Brand: Shimano Name: RM40-36 hole rear hub RM40-32 hole rear hub Color: Silver / Black random deliver Material: aluminum alloy Cassette V brake opening 135mm