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 2006 GT Bump and 2008 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.
Ratio2.77:1
Estimated speed at 90 RPMGear
Rear tire: 26×2.1.
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
2006 GT Bump
2008 GT Bump
Overview
Model Year
2006
2008
Brand
GT
GT
Model
Bump
Bump
Bicycle Type
BMX
BMX
Original MSRP
$269.99
$279.99
Colors
RootBeer Brown, Pink
Off White/Orange, Navy/White
Sizes
20" wheel
One size fits all
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
3-tube chromoly
GT cro-moly BMX dirt/street design
Fork
'05 GT dirt jump design
GT BMX design
Fork Material
Chromoly
Chromoly, unicrown crown
Drivetrain
Component Group
BMX
BMX
Crankset
GT Tubular Cr-Mo 3pc, 36 teeth
GT Tubular Cr-Mo 3pc.
Bottom Bracket
Steel, ball type
Ball type with 8 spline Cr-Mo axle
Rear Cogs
1-speed, 13 teeth
1-speed, 12 teeth
Chain
KMC Z410
KMC Z410
Pedals
'05 GT Dirt/Street platform design, aluminum body, cr-mo alxe
GT Dirt/Street platform
Brakes
Brakes
Alloy side-pull caliper front/Tektro, 907AD, dual anchor bolts, forged aluminum U-brake rear brakes, Tektro, 274A, aluminum levers
N/A front/Tektro 907A rear brakes, Tektro 274A rear levers
Cockpit & Contact Points
Headset
1 1/8" Tange Seiki FATTY 22, extra deep cup engagement
1 1/8" Tange Seiki Fatty 22
Handlebar
GT dirt/street bend, Cr-mo, 7" rise
GT dirt/street Cr-mo
Handlebar Extensions
—
Not included
Stem
GT Johnson III design, cold forged aluminum
GT FS design
Saddle
GT "Star 19" two piece design, 9mm rails
BMX mini street
Seatpost
Aluminum double bolt micro adjust
Aluminum micro-adjust
Wheels & Tires
Hubs
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
Front: GT aluminum sealed, Rear: GT sealed cassette
Rims
Alex G22, aluminum, 36 hole, 30mm width, 36-hole
36-hole
Spokes
14ga. (2.0mm) Straight Gauge
14ga. (2.0mm)
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
26 x 2.20" GT-1453
20" Kenda K-Rad
Rear Tire
26 X 2.10" GT LP-IV
20" Kenda Konxsion
Wheel Size
26" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.