Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Data limitation
No geometry is recorded for 1997 GT Mach One.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.75:1
Estimated speed at 90 RPMGear
Rear tire: 20×1.75.
Ratio2.75:1
Estimated speed at 90 RPMGear
Uses front tire 20×1.75; rear size isn’t listed.
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
1997 GT Mach One
1996 GT Mach One
Overview
Model Year
1997
1996
Brand
GT
GT
Model
Mach One
Mach One
Bicycle Type
BMX
BMX
Original MSRP
$355.99
$344.99
Colors
Black, Blue, Chrome-Plated
Black, Chrome-Plated, Dark Blue
Sizes
Boys
Boys
Weight
—
—
Frameset
Frame Construction
TIG-welded
Welded steel
Frame Material
Chromoly
Chromoly
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT Power Series 1-piece chromoly, 44 teeth
GT Power Series 1-piece chromoly, 44 teeth
Bottom Bracket
One piece
GT
BB Shell Width
68mm Threadless
68mm Threadless
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC 410, 1/2 x 3/32"
KMC 410, 1/2 x 1/8"
Pedals
GT aluminum platforms
GT alloy platforms
Brakes
Brakes
Tektro 875A V-brake rear brakes, aluminum levers
Chang Star 850AGP brakes, Lee Chi 315A-1 levers
Cockpit & Contact Points
Headset
1 1/8" threadless steel
1 1/8" threadless Dia-Compe Kontak Aheadset ST-2
Handlebar
GT Expert chromoly
GT BMX Expert
Stem
GT aluminum
GT alloy
Saddle
GT Drop Nose
GT Drop Nose
Seatpost
Chromoly micro-adjust
GT chromoly micro-adjust, 25.4 mm diameter
Wheels & Tires
Hubs
GT Mohawk
—
Rims
Weinmann 4019, 36-hole
Weinmann 4019, 36-hole
Spokes
Steel, 2.0mm straight gauge
Steel, 2.0mm straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 2.125" GT AA Pro
20 x 1.75" GT Megabite
Rear Tire
20 x 1.75" GT AA Pro
—
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
—
73°
Seat-tube angle
—
69.5°
Chainstay / rear center
—
368.3 mm
Wheelbase
—
886.5 mm
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run. Legacy reference geometry is model-level historical data whose corresponding frame size is not identified; compare those dimensions as reference values rather than size-normalized fit data.