Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Data limitation
No geometry is recorded for 2006 GT Mach One Pro and 2008 GT Mach One Pro.
- Data limitation
Only 2006 GT Mach One Pro has enough published drivetrain data for gearing calculations.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.63:1
Estimated speed at 90 RPMGear
Rear tire: 20×1.75.
Gearing unavailable for this size.
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
2006 GT Mach One Pro
2008 GT Mach One Pro
Overview
Model Year
2006
2008
Brand
GT
GT
Model
Mach One Pro
Mach One Pro
Bicycle Type
BMX
BMX
Original MSRP
$209.99
$199.99
Colors
Absolute Purple, Gloss Black
Black, Red
Sizes
20" wheel
One size fits all
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
GT BMX dirt jump styling, Cr-Mo down tube
—
Fork
GT BMX design
GT BMX
Fork Material
Steel/cromo
Cromo Blades and Steerer, unicrown crown
Drivetrain
Component Group
BMX
BMX
Crankset
GT forged three-piece type, 42 teeth
GT Forged steel 3pc.
Bottom Bracket
Steel, Ball type
Steel, ball type
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC Z410
KMC Z-410
Pedals
GT BMX platform design, aluminum body, fixed pins, cr-mo alxe
BMX Platform
Brakes
Brakes
Alloy side-pull caliper front/Tektro alloy V-type rear brakes, Tektro, 319, aluminum levers
—
Cockpit & Contact Points
Headset
1 1/8" VP-A74F HD steel, extra deep cup engagement
1 1/8" VP-A74F HD
Handlebar
GT BMX design, Hi-Ten, 7" rise
GT BMX
Handlebar Extensions
—
Not included
Stem
GT branded, aluminum
Aluminum
Saddle
GT BMX "Pro Lite", padded with stitched cover and 7mm rails
GT BMX Pro Lite
Seatpost
Aluminum, 25.4mm diameter
Aluminum
Wheels & Tires
Hubs
GT Mohawk, aluminum shell
GT Mohawk
Rims
Jalco ST-32, aluminum, 36 hole, 31mm width, 36-hole
Aluminum, 36-hole
Spokes
14ga. (2.0mm) Straight Gauge
14ga. (2.0mm)
Spoke Nipples
Brass nipples
Brass
Front Tire
20 x 2.125" GT Brody Knob
20" GT Brody Knob
Rear Tire
20 x 1.75" GT Brody Knob
—
Wheel Size
20" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.