Bicycle Archive · Specification report

2008 GT Bump

Velopedia Archive ID 13609

Overview

Model year	2008
Brand	GT
Model	Bump
Bicycle type	BMX
Archive ID	13609
Original MSRP	$279.99
Colors	Off White/Orange, Navy/White
Sizes	One size fits all

Frameset

Frame construction	TIG-welded
Frame material	GT cro-moly BMX dirt/street design
Fork	GT BMX design
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.
Bottom bracket	Ball type with 8 spline Cr-Mo axle
Rear cogs	1-speed, 12 teeth
Chain	KMC Z410
Pedals	GT Dirt/Street platform

Brakes

Brakes	N/A front/Tektro 907A 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	BMX mini street
Seatpost	Aluminum micro-adjust

Wheels & tires

Hubs	Front: GT aluminum sealed, Rear: GT sealed cassette
Rims	36-hole
Spokes	14ga. (2.0mm)
Spoke nipples	Brass nipples
Front tire	Front: 20" Kenda K-Rad, Rear: 20" Kenda Konxsion
Wheel size	20" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 27, 2026.