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1998 GT Pro Series Mini

Original specifications: 20" wheels · legacy reference geometry.

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At a glance

Archive #73041
Model year
1998
Category
BMX
Original MSRP
$329.00
Sizes
Mini
Colors
Chrome-plated
Geometry
Legacy reference
In this record
21 specifications · archived image · original MSRP · geometry
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Identification clues

1998 archived details

Published colors
Chrome-plated
Frame
4130 chromoly
Original equipment
N/A

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

Campaign
Original build4130 chromoly · 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

Mini

Published colors

Chrome-plated

Frameset

Frame ConstructionTIG-welded
Frame Material4130 chromoly
ForkGT
Fork MaterialChromoly, unicrown crown

Drivetrain

CranksetGT 3-piece jr aluminum, 43 teeth
Bottom BracketSealed cartridge
Rear Cogs1-speed, 16 teeth
Chain1/2 x 1/8"
PedalsSteel cage, resin body

Brakes

BrakesSide-pull rear brakes, Dia-Compe MX-122 levers

Cockpit & Contact Points

Headset1" threadless Aheadset MX
HandlebarGT Jr aluminum
StemGT Mini Piston
SaddleGT
SeatpostGT aluminum

Wheels & Tires

HubsGT Mohawk
RimsWeinmann Zac 2121
SpokesSteel, 2.0mm straight gauge
Spoke NipplesBrass nipples
Front Tire20 x 1 1/8" GT AA Pro
Wheel Size20" wheels

Geometry

Legacy reference · 5 measurements

Historical measurements. Frame size unknown.

All geometry measurementsLegacy reference · 5 measurements
MeasurementLegacy reference
Top tube453.4 mm
Head-tube angle72.5°
Seat-tube angle71°
Chainstay / rear center348 mm
Wheelbase863.6 mm

Frame size not recorded.

Gearing

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

Published build43T · 16T · 1-speed
Ratio2.69:1

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 and service referenceQuick reference before buying parts

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

Front tire
20 x 1 1/8" GT AA Pro
Drivetrain
1-speed
Bottom bracket / shell
Sealed cartridge
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 jr aluminum, 43 teeth · Bottom bracket: Sealed cartridge · Rear cogs: 1-speed, 16 teeth · Chain: 1/2 x 1/8"

Brakes

Inspect the brakes →

Archived: Brakes: Side-pull rear brakes, Dia-Compe MX-122 levers

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 20" wheels · Rims: Weinmann Zac 2121 · Hubs: GT Mohawk · Front tire: 20 x 1 1/8" GT AA Pro

Controls and contact points

Archived: Headset: 1" threadless Aheadset MX · Handlebar: GT Jr aluminum · Stem: GT Mini Piston · Seatpost: GT aluminum · Saddle: GT · Pedals: Steel cage, resin body

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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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