Transition Revolution HD Revolution Bikes March 10, 2014 Uncategorized Transition Revolution HD features 26″ rims with a 20mm front hub and 12x150mm rear. Built to last with 32 spokes on a 32mm wide rim. Sealed bearings in both front and back hubs and super easy to service. All in a nice shade of black of course!! For more information please contact your local dealer. Or us directly from our contact page.