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 2001 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
2001 GT Mach One
1996 GT Mach One
Overview
Model Year
2001
1996
Brand
GT
GT
Model
Mach One
Mach One
Bicycle Type
BMX
BMX
Original MSRP
$329.99
$344.99
Colors
Chrome-Plated, Gloss Black/Bright Yellow, Gloss Black/Liquid Blue
Black, Chrome-Plated, Dark Blue
Sizes
Pro
Boys
Weight
—
—
Frameset
Frame Construction
TIG-welded
Welded steel
Frame Material
4130 chromoly
Chromoly
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT 3-piece chromoly, 44 teeth
GT Power Series 1-piece chromoly, 44 teeth
Bottom Bracket
GT one piece
GT
BB Shell Width
—
68mm Threadless
Rear Cogs
1-speed, 16 teeth
1-speed, 16 teeth
Chain
KMC, 1/2 x 3/32"
KMC 410, 1/2 x 1/8"
Pedals
GT aluminum platform
GT alloy platforms
Brakes
Brakes
ProMax MX 2.0 V-Brake rear brakes, ProMax MX 1.0 V-Brake rear levers
Chang Star 850AGP brakes, Lee Chi 315A-1 levers
Cockpit & Contact Points
Headset
1 1/8" threadless Aheadset
1 1/8" threadless Dia-Compe Kontak Aheadset ST-2
Handlebar
GT Expert BMX
GT BMX Expert
Handlebar Extensions
Not included
—
Stem
GT Piston
GT alloy
Saddle
GT
GT Drop Nose
Seatpost
GT aluminum micro-adjust, 26.0mm diameter
GT chromoly micro-adjust, 25.4 mm diameter
Wheels & Tires
Hubs
GT 2000
—
Rims
Alex 7X, 36-hole
Weinmann 4019, 36-hole
Spokes
14g
Steel, 2.0mm straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 2.125" GT Brody
20 x 1.75" GT Megabite
Rear Tire
20 x 1.75" GT Brody
—
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.