Hopesthreaded 30mm bottom bracket shares the same high quality design materials and durability as our well proven 24mm version key features external bottom bracket designed for threaded bottom brackets the machined aluminium cups hold stainless steel cartridge bearings in stainless races custom swiss made bearings are double sealed which gives a much greater life span than stock units cartridge bearings are replaceable the unit is suitable for 68 73 83 and 100mm width bottom brackets desig