Bicycle Archive · Specification reportBicycle Archive · Specification report2009 GT Bump · 2011 GT Bump
| Specification | 2009 GT Bump | 2011 GT Bump |
|---|---|---|
| Overview | ||
| Model year | 2009 | 2011 |
| Brand | GT | GT |
| Model | Bump | Bump |
| Bicycle type | BMX | BMX |
| Archive ID | 18807 | 25117 |
| Original MSRP | $399.99 | — |
| Colors | Light Green, Purple | White, matte green |
| Sizes | 21.1" TT | — |
| Frameset | ||
| Frame construction | TIG-welded | Steel |
| Frame material | Chromoly main triangle | CroMo |
| Fork | GT Dirt/Street | Cromo |
| Fork material | Chromoly, unicrown crown | Steel |
| Rear shock | N/A | N/A |
| Drivetrain | ||
| Component group | BMX | BMX Mix |
| Shifters | N/A | — |
| Front derailleur | N/A | — |
| Rear derailleur | N/A | — |
| Crankset | GT Tubular Cr-Mo 3pc., 33 teeth | CroMO 3 piece, 25t teeth |
| Bottom bracket | Mid BB | Sealed Bearing |
| Cassette | Cassette cog | Cassette cog |
| Rear cogs | 1-speed, 12 teeth | 9 teeth |
| Chain | KMC Z510 | KMC Z510 |
| Pedals | GT Dirt/Street platform | GT Dirt/Street platform |
| Brakes | ||
| Brakes | Tektro 907A U-brake rear brakes, Tektro 274A rear levers | — |
| Cockpit & contact points | ||
| Headset | 1 1/8" Tange Seiki Fatty 22 | 1 1/8" integrated |
| Handlebar | GT dirt/street Cr-mo | GT Pro Steel |
| Handlebar extensions | Not included | Not included |
| Stem | GT FS design | GT freestyle drop |
| Saddle | GT Slim | Pivotal Street Design |
| Seatpost | Aluminum micro-adjust double bolt | Pivotal, 25.4mm diameter |
| Wheels & tires | ||
| Hubs | Front: GT aluminum sealed, Rear: GT sealed cassette | Front: GT Aluminum, Rear: GT Alloy |
| Rims | Alienation PBR, 32-hole/36-hole | Alienation PBR, 32-hole/36-hole |
| Spokes | Stainless, 14ga. (2.0mm) | 14ga. (2.0mm) |
| Spoke nipples | Brass | Brass |
| Front tire | 20 x 2.125" Kenda K-Rad | 20 x 2.125" Kenda K-Rad |
| Rear tire | 20 x 2.10" Kenda Kiniption | 20 x 2.1" Kenda Ko-Rolla |
| 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.