Bicycle Archive · Specification reportBicycle Archive · Specification report2001 GT Thumper · 2003 GT Thumper
| Specification | 2001 GT Thumper | 2003 GT Thumper |
|---|---|---|
| Overview | ||
| Model year | 2001 | 2003 |
| Brand | GT | GT |
| Model | Thumper | Thumper |
| Bicycle type | Freestyle/jumping | Freestyle/jumping |
| Archive ID | 35483 | 38608 |
| Original MSRP | $549.99 | $299.99 |
| Colors | Martian Green, Starlight Blue | Moro Blue, TT Gray |
| Sizes | Pro | One |
| Frameset | ||
| Frame construction | TIG-welded | TIG-welded |
| Frame material | Chromoly | Chromoly |
| Fork | GT | GT |
| Fork material | Chromoly, unicrown crown | Chromoly, unicrown crown |
| Rear shock | N/A | N/A |
| Drivetrain | ||
| Component group | N/A | N/A |
| Shifters | N/A | N/A |
| Front derailleur | N/A | N/A |
| Rear derailleur | N/A | N/A |
| Crankset | GT 3-piece chromoly, 44 teeth | GT 3-piece chromoly, 39 teeth |
| Bottom bracket | Sealed cartridge | — |
| BB shell width | — | American |
| Rear cogs | 1-speed, 16 teeth | 1-speed, 14 teeth |
| Chain | KMC, 1/2 x 1/8" | KMC 410, 1/2 x 3/16" |
| Pedals | GT aluminum platform | GT Johnson design |
| Brakes | ||
| Brakes | Tektro FX-20 U brake rear brakes, Tektro 270-AX rear levers | Tektro FX-11 U-brake rear brakes, Tektro 273A rear levers |
| Cockpit & contact points | ||
| Headset | 1 1/8" threadless Tange Seiki STE | 1 1/8" threadless Tange-Seiki TGMX |
| Handlebar | GT F.U.B.a.R. | GT BMX |
| Handlebar extensions | Not included | N/A |
| Stem | GT Johnson | GT Piston |
| Saddle | GT | GT Launch Pad |
| Seatpost | GT aluminum micro-adjust | Steel micro-adjust |
| Wheels & tires | ||
| Hubs | GT Mohawk | Aluminum, 14mm axle |
| Rims | Alex AL-MX22, 48-hole | Alex G22, 36-hole |
| Spokes | 14g | Stainless steel, 14ga. (2.0mm) straight gauge |
| Spoke nipples | Brass nipples | Brass nipples |
| Front tire | 20 X 2.10" GT LP-III | 20 x 2.10" GT LP-4 |
| Wheel size | 20" wheels | 20" wheels |
Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on November 13, 2026.