Bicycle Archive · Specification reportBicycle Archive · Specification report2000 GT Thumper · 2003 GT Thumper
| Specification | 2000 GT Thumper | 2003 GT Thumper |
|---|---|---|
| Overview | ||
| Model year | 2000 | 2003 |
| Brand | GT | GT |
| Model | Thumper | Thumper |
| Bicycle type | Freestyle/jumping | Freestyle/jumping |
| Archive ID | 45341 | 38608 |
| Original MSRP | $478.00 | $299.99 |
| Colors | Gangreen, Propane | Moro Blue, TT Gray |
| Sizes | — | 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 | DiaTech 996 U-Brake rear brakes, Dia-Compe MX-101 rear levers | Tektro FX-11 U-brake rear brakes, Tektro 273A rear levers |
| Cockpit & contact points | ||
| Headset | 1 1/8" threadless Aheadset SB-1 w/SST Oryg detangler | 1 1/8" threadless Tange-Seiki TGMX |
| Handlebar | GT Freestyle | 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 | Weinmann ZAC-X, 48-hole | Alex G22, 36-hole |
| Spokes | 2.0mm | Stainless steel, 14ga. (2.0mm) straight gauge |
| Spoke nipples | Brass nipples | Brass nipples |
| Front tire | 20 x 2.125" Powerlite Retro Tread | 20 x 2.10" GT LP-4 |
| Rear tire | 20 x 1.75" Powerlite Retro Tread | — |
| Wheel size | 20" wheels | 20" wheels |
One selected size or frame position per bicycle, matching the comparison dropdown choices used when Print / PDF was opened.
| Measurement | 2000 GT Thumper | 2003 GT Thumper |
|---|---|---|
| Selected size / position | Legacy reference | — |
| Head-tube angle | 73.5° | — |
| Seat-tube angle | 70° | — |
| Chainstay / rear center | 381 mm | — |
| Wheelbase | 967.5 mm | — |
Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on November 12, 2026.