Velopedia Bicycle Archive

2008 GT Power Series Expert

Original specifications: BMX drivetrain · 20" wheels.

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At a glance

Archive #13605

Model year: 2008
Category: BMX
Original MSRP: $399.99
Sizes: Expert 19.75"TT
Colors: Silver/Black
In this record: 22 specifications · archived image · original MSRP

Model history 9 other years

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Identification clues

2008 archived details

Published colors: Silver/Black
Frame: GT 6061 Aluminum
Original equipment: BMX

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

Original buildGT 6061 Aluminum · BMX · 20" wheels

Historical catalog variants

Archived sizes and colors

1 item record

Item-level catalog entries recovered from Velopedia’s original bicycle archive. They document how this model was listed historically; they do not identify the frame size associated with legacy reference geometry or indicate current availability.

Published sizes

Expert 19.75"TT

Published colors

Silver/Black

View 1 archived size/color combination

Size	Color
Expert 19.75"TT	Silver/Black

Historical catalog evidence. Exact specifications and naming may vary by market, production run or manufacturer revision.

Frameset

Frame Construction	TIG-welded
Frame Material	GT 6061 Aluminum
Fork	GT Aluminum
Fork Material	Aluminum, unicrown crown

Drivetrain

Component Group	BMX
Crankset	GT forged aluminum 3pc.
Bottom Bracket	Euro
Rear Cogs	1-speed, 14, 15, 16 teeth
Chain	KMC Z610
Pedals	Jr. BMX platform, aluminum

Cockpit & Contact Points

Headset	1 1/8" FSA Orbit IS-2
Handlebar	GT BMX aluminum
Handlebar Extensions	Not included
Stem	GT BMX Race
Saddle	GT Mini BMX
Seatpost	Aluminum

Wheels & Tires

Hubs	Front: GT aluminum sealed, Rear: Joy Tech cassette
Rims	Alex DA-22, 32-hole
Spokes	15ga. (1.8mm)
Spoke Nipples	Aluminum nipples
Front Tire	20" Kenda Small Block Eight
Wheel Size	20" wheels

Gearing

Original gearing is incomplete. Enter your setup to calculate ratios and cadence speeds.

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Gears Drivetrain

Front teeth Smallest rear teeth Largest rear teeth

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

Rear tire

Rear tire marking

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).

Rim diameter (BSD, mm) Tire width (mm)

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.

Cadence (RPM) Speed units

Gear, dimension and cadence changes update results automatically.

Gearing comparison
Measure	Original	Your setup
Lowest ratio	—	—
Highest ratio	—	—
Total range	—	—
Lowest-gear speed	—	—
Highest-gear speed	—	—

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

Parts & serviceability

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Original specifications

Headset · Original

1 1/8" FSA Orbit IS-2

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Rims · Original

Alex DA-22

32-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" Kenda Small Block Eight
Drivetrain: 1-speed
Bottom bracket / shell: Euro

Equipment inspection checks 9 checks based on 4 archived component groups Open equipment checksClose equipment checks

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 Aluminum · Aluminum, unicrown crown

Look for dents or shape changes and inspect the edges of welds around the head tube, bottom bracket, seat cluster and suspension mounts for hairline cracks.
Inspect the fork crown, blades, dropouts and visible steerer area. Check that it is straight, securely installed and free of cracks or impact damage.

Drivetrain

Check drivetrain wear →

Archived: Group: BMX · Crankset: GT forged aluminum 3pc. · Bottom bracket: Euro · Rear cogs: 1-speed, 14, 15, 16 teeth · Chain: KMC Z610

Check chain tension and chainline, rotate the drivetrain through a full revolution and confirm the rear axle or tensioning hardware cannot slip.
Measure chain wear with a compatible gauge and inspect chainring, cassette or freewheel teeth. A new chain does not rule out wear in the remaining drivetrain.
Turn the cranks slowly, feel for rough bearings and check for side-to-side play. Inspect crank arms, chainring bolts and pedal threads for looseness or damage.

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 20" wheels · Rims: Alex DA-22, 32-hole · Hubs: Front: GT aluminum sealed, Rear: Joy Tech cassette · Front tire: 20" Kenda Small Block Eight

Spin both wheels and watch for side-to-side and vertical movement. Check spoke tension, rim condition and hub play.
Inspect both tire casings for cuts, cracking, plugs, bulges or exposed threads and confirm the installed sizes are safe for the rims and available frame and fork clearance.

Controls and contact points

Archived: Headset: 1 1/8" FSA Orbit IS-2 · Handlebar: GT BMX aluminum · Stem: GT BMX Race · Seatpost: Aluminum · Saddle: GT Mini BMX · Pedals: Jr. BMX platform, aluminum

Apply the front brake and rock the bike to check for headset play or notchiness. Inspect the stem, handlebar and clamp zones, then confirm every fastener and control is secure.
Check that the seatpost moves for adjustment and that the saddle, post and clamp hold securely without cracks, severe corrosion or damaged hardware.

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

2008 GT Power Series Expert