Velopedia Bicycle Archive

2004 GT Power Series Expert

Original specifications: 20" wheels.

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At a glance

Archive #31446
Model year
2004
Category
BMX
Original MSRP
$299.99
Sizes
Expert
Colors
Blue
In this record
22 specifications · archived image · original MSRP
Model history 9 other years

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Identification clues

2004 archived details

Published colors
Blue
Frame
6061 T6 aluminum
Original equipment
N/A

Clues, not proof of model year. Colors vary and components may have been replaced.

Campaign
Original build6061 T6 aluminum · 20" wheels

Manufacturer catalog

Published sizes and colors

1 size · 1 color

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

Expert

Published colors

Blue

Frameset

Frame ConstructionTIG-welded
Frame Material6061 T6 aluminum
ForkGT
Fork MaterialChromoly, unicrown crown

Drivetrain

CranksetGT 3-piece chromoly, 42 teeth
Bottom BracketSealed cartridge
BB Shell Width68mm English
Rear Cogs1-speed, 16 teeth
ChainKMC Z30, 1/2 x 1/8"
PedalsAluminum

Brakes

BrakesTektro 926A Mini V rear brakes, Tektro 316A rear levers

Cockpit & Contact Points

Headset1" Semi integrated threadless
HandlebarGT BMX
StemGT Mini Piston
SaddleGT Mini
SeatpostAluminum, 22.2mm (7/8 inch) diameter

Wheels & Tires

HubsGT Mini
RimsAlex DR-13, 28-hole
SpokesSteel, 15ga. (1.8mm) straight gauge
Spoke NipplesAluminum nipples
Front Tire20 x 1 3/8" IRC Siren
Wheel Size20" wheels

Gearing

Lower gears help on climbs. Higher gears suit higher speeds.

Published build42T · 16T · 1-speed
Ratio2.63:1

Speed unavailable: wheel or tire size is missing or unclear.

Add your rear tire size to calculate speed
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.

Try other gearing

Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Your gearing setup
Gears

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Gear, dimension and cadence changes update results automatically.

Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.

Parts & serviceability

Find replacement parts

Original specifications
Chain · Original
KMC Z30

1/2 x 1/8"

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Seatpost · Original
Aluminum

22.2mm (7/8 inch) diameter

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Rims · Original
Alex DR-13

28-hole

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Parts and service referenceQuick reference before buying parts

Archived specifications for reference. Check the fitted parts before ordering.

Front tire
20 x 1 3/8" IRC Siren
Drivetrain
1-speed
Seatpost diameter
22.2 mm
Bottom bracket / shell
Sealed cartridge · 68mm English
Campaign
Equipment inspection checks 10 checks based on 5 archived component groups Open equipment checksClose equipment checks
0 of 10 checked Progress stays in this browser for this record.

Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.

Full used-bike inspection guide →

Frame and fork

Inspect the frame and fork →

Archived: Frame: TIG-welded · Fork: GT · Chromoly, unicrown crown

Drivetrain

Check drivetrain wear →

Archived: Crankset: GT 3-piece chromoly, 42 teeth · Bottom bracket: Sealed cartridge · Rear cogs: 1-speed, 16 teeth · Chain: KMC Z30, 1/2 x 1/8"

Brakes

Inspect the brakes →

Archived: Brakes: Tektro 926A Mini V rear brakes, Tektro 316A rear levers

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 20" wheels · Rims: Alex DR-13, 28-hole · Hubs: GT Mini · Front tire: 20 x 1 3/8" IRC Siren

Controls and contact points

Archived: Headset: 1" Semi integrated threadless · Handlebar: GT BMX · Stem: GT Mini Piston · Seatpost: Aluminum, 22.2mm (7/8 inch) diameter · Saddle: GT Mini · Pedals: Aluminum

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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