The shimano rs11 91011 speed clincher wheelset offering all the technology of shimano wheels at an economical price with a 24 mm high profile aluminium rim for improved aero dynamics 16 front and 20 rear stainless steel bladed straight pull spokes to make a strong yet compliant wheel 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 they also offer precision bearing