Velopedia Bicycle Archive

2006 GT Mach One Expert

Original specifications: BMX drivetrain · 20" wheels.

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At a glance

Archive #11382

Model year: 2006
Category: BMX
Original MSRP: $179.99
Sizes: 20" wheel
Colors: Absolute Blue, Gloss Black
In this record: 22 specifications · archived image · original MSRP

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Identification clues

2006 archived details

Published colors: Absolute Blue, Gloss Black
Frame: GT BMX dirt jump styling, Hi-Ten steel
Original equipment: BMX

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

Original buildGT BMX dirt jump styling, Hi-Ten steel · BMX · 20" wheels

Historical catalog variants

Archived sizes and colors

2 item records

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

20" wheel

Published colors

Absolute BlueGloss Black

View 2 archived size/color combinations

Size	Color
20" wheel	Absolute Blue
20" wheel	Gloss 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 BMX dirt jump styling, Hi-Ten steel
Fork	GT BMX design
Fork Material	Steel

Drivetrain

Component Group	BMX
Crankset	Forged one-piece typ, 36 teeth
Bottom Bracket	Steel, Ball type
Rear Cogs	1-speed
Chain	KMC Z410
Pedals	Jr. BMX design, resin

Brakes

Brakes	Tektro alloy V-type rear brakes, Tektro, 317A alloy rear levers

Cockpit & Contact Points

Headset	1" Steel
Handlebar	GT BMX design, Hi-Ten, 6- 3/4" rise
Stem	Aluminum extension with 1" steel quill
Saddle	GT Jr. BMX design, padded with stitched cover and 7mm rails
Seatpost	Steel, 22.2mm (7/8 inch) diameter

Wheels & Tires

Hubs	Front: Steel, Rear: Shimano coaster brake,
Rims	Alloy, 36 hole, 36-hole
Spokes	14ga. (2.0mm) Straight Gauge
Spoke Nipples	Brass nipples
Front Tire	20 x 1.75" GT Brody Knob
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

Front tire · Original

20 x 1.75" GT Brody Knob Replacement search: 20x1.75 bicycle tire Before ordering: Check rim type and tire clearance.

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Seatpost · Original

Steel

22.2mm (7/8 inch) diameter

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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 1.75" GT Brody Knob
Drivetrain: 1-speed
Seatpost diameter: 22.2 mm
Bottom bracket / shell: Steel, Ball type

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

2006 GT Mach One Expert