STOP AT NOTHINGFinally, a hub worthy of the X0 name. Built to roll over the toughest mountain terrain, the SRAM X0 Hub proves that being solid doesn't mean being sluggish. DOUBLE TIME ratchet design gives you smooth 6.9-degree engagementall while keeping everything light and steady. Super-precise SPEEDBALL bearings mean lower resistance, faster revolutions and no more time spent readjusting play. From pawl tooth to side cap, we went the extra mile on the X0 Hubso you have less to worry about on the trail.