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 2008 GT Bump and 2006 GT Bump.
- Data limitation
Only 2006 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.
Gearing unavailable for this size.
Ratio2.77:1
Estimated speed at 90 RPMGear
Rear tire: 26×2.1.
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
2006 GT Bump
Overview
Model Year
2008
2006
Brand
GT
GT
Model
Bump
Bump
Bicycle Type
BMX
BMX
Original MSRP
$279.99
$269.99
Colors
Off White/Orange, Navy/White
RootBeer Brown, Pink
Sizes
One size fits all
20" wheel
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
GT cro-moly BMX dirt/street design
3-tube chromoly
Fork
GT BMX design
'05 GT dirt jump design
Fork Material
Chromoly, unicrown crown
Chromoly
Drivetrain
Component Group
BMX
BMX
Crankset
GT Tubular Cr-Mo 3pc.
GT Tubular Cr-Mo 3pc, 36 teeth
Bottom Bracket
Ball type with 8 spline Cr-Mo axle
Steel, ball type
Rear Cogs
1-speed, 12 teeth
1-speed, 13 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
Alloy side-pull caliper front/Tektro, 907AD, dual anchor bolts, forged aluminum U-brake rear brakes, Tektro, 274A, aluminum levers
Cockpit & Contact Points
Headset
1 1/8" Tange Seiki Fatty 22
1 1/8" Tange Seiki FATTY 22, extra deep cup engagement
Handlebar
GT dirt/street Cr-mo
GT dirt/street bend, Cr-mo, 7" rise
Handlebar Extensions
Not included
—
Stem
GT FS design
GT Johnson III design, cold forged aluminum
Saddle
BMX mini street
GT "Star 19" two piece design, 9mm rails
Seatpost
Aluminum micro-adjust
Aluminum double bolt micro adjust
Wheels & Tires
Hubs
Front: GT aluminum sealed, Rear: GT sealed cassette
Front: '05 GT branded, aluminum body, sealed Mech. bearings, 3/8" Cr-Mo axle, 36 h, Rear: '05 GT branded, aluminum body, sealed Mech. bearins, 14mm Cr-Mo axle, 36 ho
Rims
36-hole
Alex G22, aluminum, 36 hole, 30mm width, 36-hole
Spokes
14ga. (2.0mm)
14ga. (2.0mm) Straight Gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20" Kenda K-Rad
26 x 2.20" GT-1453
Rear Tire
20" Kenda Konxsion
26 X 2.10" GT LP-IV
Wheel Size
20" wheels
26" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.