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 2001 GT Fly.
- Gearing
2004 GT Fly has a 11% lower climbing ratio than 2001 GT Fly.
A lower ratio gives more mechanical advantage; rear-wheel rollout determines distance per crank turn.
- Identity & price
2004 GT Fly had an original MSRP $110 lower than 2001 GT Fly.
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.
Ratio2.75:1
Estimated speed at 90 RPMGear
Uses front tire 20×2.1; rear size isn’t listed.
Ratio2.44:1
Estimated speed at 90 RPMGear
Rear tire: 20×2.1.
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
2001 GT Fly
2004 GT Fly
Overview
Model Year
2001
2004
Brand
GT
GT
Model
Fly
Fly
Bicycle Type
Freestyle/jumping
Freestyle/jumping
Original MSRP
$309.99
$199.99
Colors
Starlight Blue, Taupe
Blue, Yellow
Sizes
Pro
One
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Chromoly
Chromoly down tube/hi-tensile steel
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT 1-piece chromoly, 44 teeth
GT one-piece, 39 teeth
Bottom Bracket
One piece
—
BB Shell Width
—
American
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC, 1/2 x 1/8"
KMC Z410, 1/2 x 3/16"
Pedals
GT aluminum platform
GT BMX Design Aluminum
Brakes
Brakes
Tektro 906A U-brake rear brakes, Tektro 287A rear levers
Tektro 907A U-brake rear brakes, Tektro 289A rear levers
Cockpit & Contact Points
Headset
1 1/8" threadless Tange Seiki STE
1 1/8" threadless Victor VP-A74F w/SST Oryg
Handlebar
GT Expert BMX
GT BMX
Handlebar Extensions
Not included
—
Stem
GT Piston
GT Piston
Saddle
GT
GT Jr Jump, 9mm rails
Seatpost
GT aluminum micro-adjust
Aluminum, 25.4mm diameter
Wheels & Tires
Hubs
GT Mohawk
Steel, nutted
Rims
Alex X-303, 48-hole
Jalco, 36-hole
Spokes
14g
Stainless steel, 14ga. (2.0mm) straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 X 2.10" GT LP-III
20 x 2.20" GT 1453
Rear Tire
—
20 x 2.10" GT LP-4
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
—
74.5°
Seat-tube angle
—
71°
Chainstay / rear center
—
355.6 mm
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run. Legacy reference geometry is model-level historical data whose corresponding frame size is not identified; compare those dimensions as reference values rather than size-normalized fit data.