Velopedia Bicycle Archive
Compare Bicycles
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 2008 GT Bump and 2007 GT Bump.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Gearing unavailable for this size.
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
2008 GT Bump
2007 GT Bump
Overview
Model Year
2008
2007
Brand
GT
GT
Model
Bump
Bump
Bicycle Type
BMX
Freestyle/jumping
Original MSRP
$279.99
$269.99
Colors
Off White/Orange, Navy/White
Matte Navy Blue, Matte Brick
Sizes
One size fits all
20" wheel
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
GT cro-moly BMX dirt/street design
Chromoly
Fork
GT BMX design
'05 GT dirt jump
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Component Group
BMX
BMX Mix
Crankset
GT Tubular Cr-Mo 3pc.
GT Tubular Cr-Mo 3pc.
Bottom Bracket
Ball type with 8 spline Cr-Mo axle
Ball type with 8 spline Cr-Mo axle
Rear Cogs
1-speed, 12 teeth
1-speed, 12 teeth
Chain
KMC Z410
KMC Z410
Pedals
GT Dirt/Street platform
'05 GT Dirt/Street platform design, aluminum body, cr-mo alxe
Brakes
Brakes
N/A front/Tektro 907A rear brakes, Tektro 274A rear levers
Tektro, FX-330 rear brakes, Tektro 274A levers
Cockpit & Contact Points
Headset
1 1/8" Tange Seiki Fatty 22
1 1/8" threadless 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
Velo mini street
Seatpost
Aluminum micro-adjust
Alloy Micro adjust
Wheels & Tires
Hubs
Front: GT aluminum sealed, Rear: GT sealed cassette
Front: GT aluminum sealed, Rear: GT sealed cassette
Rims
36-hole
Alex G22, 36-hole
Spokes
14ga. (2.0mm)
14ga. (2.0mm) straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20" Kenda K-Rad
Front: 26 x 2.125" Front: Kenda K-Rad, Rear: 26 x 2.10" Kenda Konxsion
Rear Tire
20" Kenda Konxsion
—
Wheel Size
20" wheels
26" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.