Br&-X Spot Single Speed Rear Hub Flange Diameters (PCD): 48mm Left & Right hand side (Measured from spoke hole centre to opposing spoke hole centre) Flange Offset: 40.5mm Left & Right hand side (Measured from flange to centre of hub) Spoke Hole Diameter: 2.3mm Buy Br&-X Spot Single Speed Rear Hub from Chain Reaction Cycles, the World’s Largest Online Bike Store.