Velopedia Bicycle Archive

2008 GT Bump

Original specifications: BMX drivetrain · 20" wheels.

Share owner experience

At a glance

Archive #13609

Model year: 2008
Category: BMX
Original MSRP: $279.99
Sizes: One size fits all
Colors: Off White/Orange, Navy/White
In this record: 24 specifications · archived image · original MSRP

Model history 11 other years

Browse other years

Compare side by side

Identification clues

2008 archived details

Published colors: Off White/Orange, Navy/White
Frame: GT cro-moly BMX dirt/street design
Original equipment: BMX

Clues, not proof of model year. Colors vary and components may have been replaced.

Original buildGT cro-moly BMX dirt/street design · BMX · 20" wheels

Historical catalog variants

Archived sizes and colors

2 item records

Item-level catalog entries recovered from Velopedia’s original bicycle archive. They document how this model was listed historically; they do not identify the frame size associated with legacy reference geometry or indicate current availability.

Published sizes

one size fits all

Published colors

Off White/OrangeNavy/White

View 2 archived size/color combinations

Size	Color
one size fits all	Off White/Orange
one size fits all	Navy/White

Historical catalog evidence. Exact specifications and naming may vary by market, production run or manufacturer revision.

Frameset

Frame Construction	TIG-welded
Frame Material	GT cro-moly BMX dirt/street design
Fork	GT BMX design
Fork Material	Chromoly, unicrown crown

Drivetrain

Component Group	BMX
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	20" Kenda K-Rad
Rear Tire	20" Kenda Konxsion
Wheel Size	20" wheels

Gearing

Original gearing is incomplete. Enter your setup to calculate ratios and cadence speeds.

Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Gears Drivetrain

Front teeth Smallest rear teeth Largest rear teeth

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Rear tire marking

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

Rim diameter (BSD, mm) Tire width (mm)

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Cadence (RPM) Speed units

Gear, dimension and cadence changes update results automatically.

Gearing comparison
Measure	Original	Your setup
Lowest ratio	—	—
Highest ratio	—	—
Total range	—	—
Lowest-gear speed	—	—
Highest-gear speed	—	—

Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.

Parts and service referenceQuick reference before buying parts

Archived specifications for reference. Check the fitted parts before ordering.

Front tire: Front: 20" Kenda K-Rad, Rear: 20" Kenda Konxsion
Drivetrain: 1-speed
Bottom bracket / shell: Ball type with 8 spline Cr-Mo axle

Have you owned this model?Help document firsthand fit, ride and maintenance details that may no longer be available.

This archive record has limited published detail. Share what would help another rider understand how this model fit, rode and held up over time. Velopedia reviews every contribution before publication.

Display name Required Email address Required · private Ownership Required When or how long you owned it Required Frame size Required Primary type of riding Required Rider height Optional

Overall owner experience Required · at least 120 characters0 of 120 minimum characters Would you own one again? Optional

Add fit, maintenance and buyer detailsOptional · five additional fields

Fit and sizing observations Optional Long-term strengths Optional Problems or recurring maintenance Optional Parts replaced or upgraded Optional What a used buyer should inspect Optional

Your contribution goes directly to Velopedia’s private review queue. We’ll email an optional confirmation link plus a private edit and withdrawal link, but you do not need to confirm your email before an administrator can review or approve the submission.

Already contributed? Send me a fresh private edit link

For privacy, Velopedia shows the same confirmation whether or not an experience exists.

Checking current listings…

Find this bike on eBay

Search eBay US; check the model year, size and installed components. We may earn a commission from purchases.

Search 2008 model Search all years

Campaign

Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

2008 GT Bump