Freecoaster rear wheel Federal Motion with the new AERO XL 40mm oval rim. The freecoaster hub gap is adjustable thanks to the spacers included, simply add or remove.to fit tire size minimum 20 x 2.30"SPECS :Hub: Federal Motion Freecoaster with male axle - 36 holes - 14mmRim: Federal AERO XL double-wall welded - 36 holes-Spokes : Federal ButtedHubguards: 2 Hubguard NylonDriver : 9 teethTire size minimum: 20 x 2.30''Available with right-hand drive (RHD) or left-hand drive (LHD)