Diamondback Nitrus Junior BMX Bike (20-Inch Wheels), Blue, 20-Inch Junior BMX racing bike with heat-treated aluminum frame Chromoly steerer fork with Hi-Ten steel legs; 1-inch threadless headset Tektro mini-linear brakes; alloy body/cage pedals Kenda K50 20-inch tires and 36-spoke aluminum wheels DB Puny saddle with 22.2mm aluminum integrated seatpost