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 2003 GT Mach 1 and 2002 GT Mach 1.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Gearing unavailable for this size.
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
2003 GT Mach 1
2002 GT Mach 1
Overview
Model Year
2003
2002
Brand
GT
GT
Model
Mach 1
Mach 1
Bicycle Type
BMX
BMX
Original MSRP
$179.99
$169.99
Colors
Chrom Red, Metallic Silver
Red
Sizes
Junior
—
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Hi-tensile steel
Hi-tensile steel
Fork
GT
GT
Fork Material
Hi-tensile steel, unicrown crown
Hi-tensile steel, unicrown crown
Drivetrain
Crankset
Steel one-piece, 36 teeth
Steel one-piece
BB Shell Width
American
American
Rear Cogs
1-speed
1-speed, 16 teeth
Chain
KMC 410, 1/2 x 1/8"
1/2 x 1/8"
Pedals
BMX
Nylon
Brakes
Brakes
Coaster brake rear
Tektro 906A U-brake rear brakes, Tektro 287A rear levers
Cockpit & Contact Points
Headset
1" steel, threaded
1" steel
Handlebar
GT BMX
GT hi-ten
Stem
Aluminum
GT Jr Design
Saddle
GT JR. BMX
GT Dropnose
Seatpost
Chromoly, 22.2mm (7/8 inch) diameter
Chromoly, 22.2mm (7/8 inch) diameter
Wheels & Tires
Hubs
Front: steel, nutted, Rear: Shimano Coaster Brake
Front: steel, nutted, Rear: Shimano Coaster Brake
Rims
Steel, 28-hole
Alex G303, 36-hole
Spokes
Steel, 14ga. (2.0mm) straight gauge
UCP, 14ga. (2.0mm) straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
16 x 2.125" BMX knobby
20 x 1.75" Kenda K-Rad
Wheel Size
16" wheels
20" wheels
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.