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 Vertigo.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.69:1
Estimated speed at 90 RPMGear
Uses front tire 20×1.75; rear size isn’t listed.
Ratio2.69:1
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 Vertigo
1996 GT Vertigo
Overview
Model Year
1997
1996
Brand
GT
GT
Model
Vertigo
Vertigo
Bicycle Type
Freestyle/jumping
Freestyle/jumping
Original MSRP
$293.99
$289.99
Colors
Blue, Chrome-Plated, Green
Black, Chrome-Plated
Sizes
Boys
Boys
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded steel
Frame Material
Chromoly main triangle/hi-tensile steel rear stays
Chromoly/hi-tensile steel
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT 1-piece steel, 43 teeth
GT, 43 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 1/8"
KMC 410, 1/2 x 1/8"
Pedals
GT nylon platforms
GT alloy
Brakes
Brakes
Dia-Compe Bulldog brakes, aluminum levers
Dia-Compe Bulldog brakes, Chang Star 257A levers
Cockpit & Contact Points
Headset
1" steel w/SST Oryg detangler
1" GT steel
Handlebar
GT chromoly
GT freestyle
Stem
GT
GT alloy
Saddle
GT plastic
GT freestyle
Seatpost
GT laid back, chromoly
GT chromoly, 22.2 mm (7/8 inch) diameter
Wheels & Tires
Hubs
Aluminum nutted
—
Rims
Weinmann aluminum, 48-hole
Weinmann 2121, 48-hole
Spokes
Steel, 2.0mm straight gauge
Steel, 2.0mm straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 X 1.75" GT LP III
20 X 1.75" GT LP-II
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
—
73°
Seat-tube angle
—
71°
Chainstay / rear center
—
381 mm
Wheelbase
—
881.4 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.