Velopedia Bicycle Archive
Compare Bicycles
Compare published geometry, gearing and specifications for up to three bicycles.
Edit comparison
Add a bicycle
Search the Archive without leaving this comparison.
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 Vertigo.
- Data limitation
Only 2001 GT Vertigo 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.
Ratio2.69:1
Estimated speed at 90 RPMGear
Uses front tire 20×1.95; rear size isn’t listed.
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
2001 GT Vertigo
1998 GT Vertigo
Overview
Model Year
2001
1998
Brand
GT
GT
Model
Vertigo
Vertigo
Bicycle Type
Freestyle/jumping
Freestyle/jumping
Original MSRP
$309.99
$310.00
Colors
Chrome-Plated, Seafoam Green, Taupe
Chrome-plated, Gloss Black, Pearlized Blue
Sizes
Pro
Pro
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Chromoly main triangle/hi-tensile steel rear stays
4130 chromoly main triangle/hi-tensile steel rear stays
Fork
GT
GT
Fork Material
Chromoly, unicrown crown
Chromoly, unicrown crown
Drivetrain
Crankset
GT 1-piece steel, 43 teeth
GT 1-piece chromoly, 45 teeth
Bottom Bracket
Steel
—
BB Shell Width
—
American
Rear Cogs
1-speed, 16 teeth
1-speed
Chain
KMC, 1/2 x 1/8"
1/2 x 1/8"
Pedals
GT aluminum platform
GT nylon platforms
Brakes
Brakes
Tektro 906A U-brake brakes, Tektro 287A levers
Dia-Compe Bulldog
Cockpit & Contact Points
Headset
1 1/8" threadless Tange Seiki STE
1"
Handlebar
GT Freestyle
GT Freestyle chromoly
Handlebar Extensions
Not included
—
Stem
GT Piston
GT Piston
Saddle
GT
GT Freestyle
Seatpost
Steel
GT chromoly
Wheels & Tires
Hubs
GT Mohawk
GT Mohawk
Rims
Alex X-303, 48-hole
Weinmann Zac 2121, 48-hole
Spokes
14g
Steel, 2.0mm straight gauge
Spoke Nipples
Brass nipples
—
Front Tire
20 x 1.95" GT Air Bags
20 X 2.10" GT LP III
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
—
876.3 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.