Shimano rs21 road rear wheelthis rs21 clincher wheel offers excellent quality and durability at a competitive price features steel butted and bladed straight pull spokes with a 2 cross lacing pattern improve lateral and torsional power transmission rigidity elbow less spokes make for a strong yet compliant wheel high lateral rigidity is produced with a 3mm offset asymmetric rim and wide flange spacing the hub uses angular contact bearings designed to cradle the balls giving both radial and la