27.5 650B CENTRE LOCK DISC REAR WHEEL SHIMANOFH -TX505 584 -21RIM. SHIMANOFH -TX505 REAR 8/9/10 SPEED CASSETTE HUB 135mm OVERLOCK NUT DISTANCE WITH QUICK RELEASE AND CENTRE LOCK DISC MOUNT HUB. SHIMANO REAR WHEEL WITH CENTRE LOCK DISC MOUNT HUB FOR MTB BIKES.