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 2005 GT Power Series Pro.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.69:1
Estimated speed at 90 RPMGear
Rear tire: 20×1.75.
Ratio2.75:1
Estimated speed at 90 RPMGear
Rear tire: 20×1.75.
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
2005 GT Power Series Pro
2004 GT Power Series Pro
Overview
Model Year
2005
2004
Brand
GT
GT
Model
Power Series Pro
Power Series Pro
Bicycle Type
BMX
BMX
Original MSRP
$279.99
$249.99
Colors
Factory Blue
Blue
Sizes
Pro
Pro
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
6061 T6 aluminum
6061 T6 aluminum
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT Tubular , 43 teeth
GT one-piece, 44 teeth
Bottom Bracket
Loose ball
—
BB Shell Width
—
American
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC Z610, 1/2 x 1/8"
KMC Z30, 1/2 x 1/8"
Pedals
Aluminum platform
GT BMX Design Aluminum
Brakes
Brakes
Tektro 924AL rear brakes, Tektro 319A rear levers
Tektro 924AL rear brakes, Tektro 319A rear levers
Cockpit & Contact Points
Headset
1 1/8" integrated Tange Seiki Fatty 22
1 1/8" threadless Victor VP-A74F
Handlebar
Hi-tensile
GT BMX
Stem
Aluminum
GT Piston
Saddle
GT BMX Pro Lite
GT BMX
Seatpost
Aluminum micro-adjust
Aluminum micro-adjust, 27.0mm diameter
Wheels & Tires
Hubs
GT aluminum
GT BMX
Rims
Alex G303
Alex G303, 36-hole
Spokes
14ga. (2.0mm) straight gauge
Steel, 14ga. (2.0mm) straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 2.125" IRC Siren
20 x 2.125" IRC Siren
Rear Tire
20 x 1.75" IRC Siren
20 x 1.75" IRC Siren
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
—
74.5°
Seat-tube angle
—
70.5°
Chainstay / rear center
—
368.3 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.