Shimano m435 rear hubshimanos m435 rear hub has a strong and durable aluminium construction and a steel freehub body it uses the commonly compatible quick release axle type and centre lock brake rotor mount it also features high quality seals that prevent mud intrusion and an increased ball bearing count to provide smooth rotation features material clear coated aluminium shell steel freehub quick release centre lock disc brake mount 32 holes increased ball bearing count high quality seals