Bicycle Archive · Specification reportBicycle Archive · Specification report2003 GT Bump · 2004 GT Bump
| Specification | 2003 GT Bump | 2004 GT Bump |
|---|---|---|
| Overview | ||
| Model year | 2003 | 2004 |
| Brand | GT | GT |
| Model | Bump | Bump |
| Bicycle type | Freestyle/jumping | Freestyle/jumping |
| Archive ID | 38607 | 31429 |
| Original MSRP | $249.99 | $249.99 |
| Colors | Blue, Yellow | Red, Silver |
| Sizes | One | One |
| Frameset | ||
| Frame construction | TIG-welded | TIG-welded |
| Frame material | Chromoly main triangle/hi-tensile steel rear stays | Chromoly main triangle/hi-tensile steel rear stays |
| 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, 39 teeth | GT 3-piece chromoly, 39 teeth |
| BB shell width | American | American |
| Rear cogs | 1-speed, 14 teeth | 1-speed, 14 teeth |
| Chain | KMC 410, 1/2 x 3/16" | KMC 410, 1/2 x 3/16" |
| Pedals | GT Johnson design | GT Johnson design |
| Brakes | ||
| Brakes | Tektro 907A U-brake rear brakes, Tektro 274A rear levers | Tektro 907A U-brake rear brakes, Tektro 274A rear levers |
| Cockpit & contact points | ||
| Headset | 1 1/8" threadless Victor VP-A74F | 1 1/8" threadless Victor VP-A74F |
| Handlebar | GT BMX | GT BMX |
| Handlebar extensions | N/A | N/A |
| Stem | GT Piston | GT Piston |
| Saddle | GT Jr Jump, 9mm rails | GT Jr Jump, 9mm rails |
| Seatpost | Steel micro-adjust | Steel micro-adjust |
| Wheels & tires | ||
| Hubs | Aluminum, 14mm axle | Aluminum, 14mm axle |
| Rims | Alex G22, 36-hole | Alex G22, 36-hole |
| Spokes | Stainless steel, 14ga. (2.0mm) straight gauge | Stainless steel, 14ga. (2.0mm) straight gauge |
| Spoke nipples | Brass nipples | Brass nipples |
| Front tire | 20 x 2.10" GT LP-4 | 20 x 2.20" GT 1453 |
| Rear tire | — | 20 x 2.10" GT LP-4 |
| 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 | 2003 GT Bump | 2004 GT Bump |
|---|---|---|
| Selected size / position | — | Legacy reference |
| Head-tube angle | — | 74.5° |
| Seat-tube angle | — | 71° |
| Chainstay / rear center | — | 355.6 mm |
Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on November 13, 2026.