Bicycle Archive · Specification report

2009 GT Bump

Velopedia Archive ID 18807

Overview

Model year	2009
Brand	GT
Model	Bump
Bicycle type	BMX
Archive ID	18807
Original MSRP	$399.99
Colors	Light Green, Purple
Sizes	21.1" TT

Frameset

Frame construction	TIG-welded
Frame material	Chromoly main triangle
Fork	GT Dirt/Street
Fork material	Chromoly, unicrown crown
Rear shock	N/A

Drivetrain

Component group	BMX
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	GT Tubular Cr-Mo 3pc., 33 teeth
Bottom bracket	Mid BB
Cassette	Cassette cog
Rear cogs	1-speed, 12 teeth
Chain	KMC Z510
Pedals	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
Handlebar	GT dirt/street Cr-mo
Handlebar extensions	Not included
Stem	GT FS design
Saddle	GT Slim
Seatpost	Aluminum micro-adjust double bolt

Wheels & tires

Hubs	Front: GT aluminum sealed, Rear: GT sealed cassette
Rims	Alienation PBR, 32-hole/36-hole
Spokes	Stainless, 14ga. (2.0mm)
Spoke nipples	Brass
Front tire	Front: 20 x 2.125" Kenda K-Rad, Rear: 20 x 2.10" Kenda Kiniption
Wheel size	20" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 26, 2026.