Whites Rim Lock Alloy - 1.85The unique combination of the aluminium body and moulded rubber flap assures that the rim lock has a firm and strong grip of the tyre. The serrated edge of the aluminium body secures the tyre against the rim while the rubber flap reduces abrasions and in turn reduces the heat of the tube. Aluminium body increaes grip of the tyre Rubber flap protects against abrasions and reduces tube heat Serrated edge on body secures tyre against the rim Rim lock