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 2003 GT Bump and 2001 GT Bump.
- Identity & price
2003 GT Bump had an original MSRP $160 lower than 2001 GT Bump.
Original MSRP is the published list price when new, not today’s used-bike value.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.79:1
Estimated speed at 90 RPMGear
Uses front tire 20×2.1; rear size isn’t listed.
Ratio2.75:1
Estimated speed at 90 RPMGear
Uses front tire 20×2.1; rear size isn’t listed.
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
2003 GT Bump
2001 GT Bump
Overview
Model Year
2003
2001
Brand
GT
GT
Model
Bump
Bump
Bicycle Type
Freestyle/jumping
Freestyle/jumping
Original MSRP
$249.99
$409.99
Colors
Blue, Yellow
Galaxie Silver, Raven Black
Sizes
One
Pro
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Chromoly main triangle/hi-tensile steel rear stays
Chromoly
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT 3-piece chromoly, 39 teeth
GT 3-piece chromoly, 44 teeth
Bottom Bracket
—
One piece
BB Shell Width
American
—
Rear Cogs
1-speed, 14 teeth
1-speed, 16 teeth
Chain
KMC 410, 1/2 x 3/16"
KMC, 1/2 x 1/8"
Pedals
GT Johnson design
GT aluminum platform
Brakes
Brakes
Tektro 907A U-brake rear brakes, Tektro 274A rear levers
Tektro FX-10 rear brakes, Tektro 217A rear levers
Cockpit & Contact Points
Headset
1 1/8" threadless Victor VP-A74F
1 1/8" threadless Tange Seiki STE
Handlebar
GT BMX
GT Freestyle
Handlebar Extensions
—
Not included
Stem
GT Piston
GT Johnson
Saddle
GT Jr Jump, 9mm rails
GT
Seatpost
Steel micro-adjust
GT aluminum micro-adjust
Wheels & Tires
Hubs
Aluminum, 14mm axle
GT Mohawk
Rims
Alex G22, 36-hole
Alex AL-MX22, 48-hole
Spokes
Stainless steel, 14ga. (2.0mm) straight gauge
14g
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 2.10" GT LP-4
20 X 2.10" GT LP-III
Wheel Size
20" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.