BB30 bearing set for road bike and mtb.-Frame width:68 or 73 mm.-Frame inner diameter:42 mm.-To install BB30 or PF30 cranks.-CEMA SRC Ceramic, Stainless or Steel bearings.-Aluminium dust covers, circlips, wave washer.-Colour:silver.Features:Frame Inner Diameter:42 mm.Shell width:68.73 mm.Axle diameter:30 mm.crank type:BB30.PF30.Bearing type:ceramic.Color:silver.