Diamondback Nitrus 24 BMX Bike (24-Inch Wheels) 24-inch BMX racing bike with heat-treated aluminum frame Chromoly steerer fork with Hi-Ten steel legs; 1-1/8-inch threadless headset Tektro alloy linear pull brakes; DB Sound alloy platform pedals 24-inch Comp III style tires and 36-spoke aluminum wheels DB BMX padded saddle and 26.8mm alloy micro adjust seatpost