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.
Ratio2.75:1
Estimated speed at 90 RPMGear
Rear tire: 20×1.75.
Ratio2.69:1
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
2004 GT Power Series Pro
2005 GT Power Series Pro
Overview
Model Year
2004
2005
Brand
GT
GT
Model
Power Series Pro
Power Series Pro
Bicycle Type
BMX
BMX
Original MSRP
$249.99
$279.99
Colors
Blue
Factory 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 one-piece, 44 teeth
GT Tubular , 43 teeth
Bottom Bracket
—
Loose ball
BB Shell Width
American
—
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC Z30, 1/2 x 1/8"
KMC Z610, 1/2 x 1/8"
Pedals
GT BMX Design Aluminum
Aluminum platform
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" threadless Victor VP-A74F
1 1/8" integrated Tange Seiki Fatty 22
Handlebar
GT BMX
Hi-tensile
Stem
GT Piston
Aluminum
Saddle
GT BMX
GT BMX Pro Lite
Seatpost
Aluminum micro-adjust, 27.0mm diameter
Aluminum micro-adjust
Wheels & Tires
Hubs
GT BMX
GT aluminum
Rims
Alex G303, 36-hole
Alex G303
Spokes
Steel, 14ga. (2.0mm) straight gauge
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.