Bicycle Archive · Specification report

Bicycle comparison

2008 GT Bump · 2009 GT Bump

Specification	2008 GT Bump	2009 GT Bump
Overview
Model year	2008	2009
Brand	GT	GT
Model	Bump	Bump
Bicycle type	BMX	BMX
Archive ID	13609	18807
Original MSRP	$279.99	$399.99
Colors	Off White/Orange, Navy/White	Light Green, Purple
Sizes	One size fits all	21.1" TT
Frameset
Frame construction	TIG-welded	TIG-welded
Frame material	GT cro-moly BMX dirt/street design	Chromoly main triangle
Fork	GT BMX design	GT Dirt/Street
Fork material	Chromoly, unicrown crown	Chromoly, unicrown crown
Rear shock	N/A	N/A
Drivetrain
Component group	BMX	BMX
Shifters	N/A	N/A
Front derailleur	N/A	N/A
Rear derailleur	N/A	N/A
Crankset	GT Tubular Cr-Mo 3pc.	GT Tubular Cr-Mo 3pc., 33 teeth
Bottom bracket	Ball type with 8 spline Cr-Mo axle	Mid BB
Cassette	—	Cassette cog
Rear cogs	1-speed, 12 teeth	1-speed, 12 teeth
Chain	KMC Z410	KMC Z510
Pedals	GT Dirt/Street platform	GT Dirt/Street platform
Brakes
Brakes	N/A front/Tektro 907A rear brakes, Tektro 274A rear levers	Tektro 907A U-brake rear brakes, Tektro 274A rear levers
Cockpit & contact points
Headset	1 1/8" Tange Seiki Fatty 22	1 1/8" Tange Seiki Fatty 22
Handlebar	GT dirt/street Cr-mo	GT dirt/street Cr-mo
Handlebar extensions	Not included	Not included
Stem	GT FS design	GT FS design
Saddle	BMX mini street	GT Slim
Seatpost	Aluminum micro-adjust	Aluminum micro-adjust double bolt
Wheels & tires
Hubs	Front: GT aluminum sealed, Rear: GT sealed cassette	Front: GT aluminum sealed, Rear: GT sealed cassette
Rims	36-hole	Alienation PBR, 32-hole/36-hole
Spokes	14ga. (2.0mm)	Stainless, 14ga. (2.0mm)
Spoke nipples	Brass nipples	Brass
Front tire	20" Kenda K-Rad	20 x 2.125" Kenda K-Rad
Rear tire	20" Kenda Konxsion	20 x 2.10" Kenda Kiniption
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.