Shimano rs21 road wheelsetthis rs21 clincher wheel offers excellent quality and durability at a competitive price the hub uses angular contact bearings designed to cradle the balls giving both radial and lateral support for superior strength and durability in real world riding conditions features steel butted and bladed straight pull spokes with a 2 cross lacing pattern rear improve lateral and torsional power transmission rigidity elbow less spokes make for a strong yet compliant wheel hi