The GT Thumper has a great mix of parts for a entry-level priced freestyle BMX bike. GT spec'd out this bicycle with 3-piece chromoly cranks, an option usually reserved for bikes that retail for $100+ more than this. The Thumper is ready to shread up the local park and streets.

Frame & Fork

• Frame Construction: TIG-welded
• Frame Tubing Material: Chromoly
• Fork Brand & Model: GT
• Fork Material: Chromoly, unicrown crown

Components

• Brakeset: Tektro FX-11 U-brake rear brakes, Tektro 273A rear levers
• Crankset: GT 3-piece chromoly, 39 teeth
• Pedals: GT BMX Design Aluminum
• Bottom Bracket: Generic Chromoly
• BB Shell: American
• Rear Cogs: 1-speed, 14 teeth
• Chain: KMC Z510H, 1/2 x 3/16"
• Seatpost Steel: Micro-Adjust
• Saddle: GT Launch Pad
• Handlebar: GT BMX
• Handlebar Stem: GT Piston
• Headset: 1-1/8" Threadless Tien Hsin w/SST Oryg

Wheels

• Hubs: Aluminum, 14mm axle
• Rims: Alex DX-2418, 36-hole
• Tires Front: 20 x 2.20" GT 1453, Rear: 20 x 2.10" GT LP-4
• Spoke: Brand Stainless 14g (2.0mm) straight gauge
• Spoke Nipples: Brass nipples