Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Data limitation
No geometry is recorded for 2012 GT Bump and 2008 GT Bump.
- Data limitation
Only 2012 GT Bump has enough published drivetrain data for gearing calculations.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.78:1
Speed unavailable: wheel or tire size is missing or unclear.
Gearing unavailable for this size.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Complete specification tableShows different published values and gaps where a bicycle lacks data. Different wording reflects source language, not necessarily different components. Swipe for more columns.
Specification
2012 GT Bump
2008 GT Bump
Overview
Model Year
2012
2008
Brand
GT
GT
Model
Bump
Bump
Bicycle Type
BMX
BMX
Original MSRP
Not documented
$279.99
Colors
Satin Black, Satin White
Off White/Orange, Navy/White
Sizes
One Size
One size fits all
Weight
—
—
Frameset
Frame Construction
—
TIG-welded
Frame Material
Straight Guage Cro-Mo
GT cro-moly BMX dirt/street design
Fork
GT Cro-Mo
GT BMX design
Fork Material
—
Chromoly, unicrown crown
Drivetrain
Component Group
—
BMX
Crankset
GT 3-pc Cro-Mo 175mm 25t
GT Tubular Cr-Mo 3pc.
Bottom Bracket
Sealed Mid
Ball type with 8 spline Cr-Mo axle
Cassette
KT Cro-Mo 9t
—
Rear Cogs
—
1-speed, 12 teeth
Chain
KMC Z510
KMC Z410
Pedals
GT Pro Plastic
GT Dirt/Street platform
Brakes
Brakes
Tektro FX340R
N/A front/Tektro 907A rear brakes, Tektro 274A rear levers
Cockpit & Contact Points
Headset
FDP Integrated
1 1/8" Tange Seiki Fatty 22
Handlebar
GT Freestyle
GT dirt/street Cr-mo
Handlebar Extensions
—
Not included
Stem
GT Freestyle
GT FS design
Saddle
GT Dirt Unified
BMX mini street
Seatpost
GT Unified
Aluminum micro-adjust
Wheels & Tires
Hubs
GT Alloy Sealed 32h GT Alloy Sealed Cassette 36h
Front: GT aluminum sealed, Rear: GT sealed cassette
Rims
—
36-hole
Spokes
—
14ga. (2.0mm)
Spoke Nipples
—
Brass nipples
Front Tire
GT Dirt 2.125
20" Kenda K-Rad
Rear Tire
—
20" Kenda Konxsion
Wheel Size
—
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.