Bicycle Archive · Specification report

1998 GT Vertigo

Velopedia Archive ID 78032

Overview

Model year	1998
Brand	GT
Model	Vertigo
Bicycle type	Freestyle/jumping
Archive ID	78032
Original MSRP	$310.00
Colors	Chrome-plated, gloss black, Pearlized Blue
Sizes	Pro

Frameset

Frame construction	TIG-welded
Frame material	4130 chromoly main triangle/hi-tensile steel rear stays
Fork	GT
Fork material	Chromoly, unicrown crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	GT 1-piece chromoly, 45 teeth
BB shell width	American
Rear cogs	1-speed
Chain	1/2 x 1/8"
Pedals	GT nylon platforms

Brakes

Brakes	Dia-Compe Bulldog

Cockpit & contact points

Headset	1"
Handlebar	GT Freestyle chromoly
Handlebar extensions	N/A
Stem	GT Piston
Saddle	GT Freestyle
Seatpost	GT chromoly

Wheels & tires

Hubs	GT Mohawk
Rims	Weinmann Zac 2121, 48-hole
Spokes	Steel, 2.0mm straight gauge
Front tire	20 X 2.10" GT LP III
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	442 mm
Head-tube angle	73°
Seat-tube angle	71°
Chainstay / rear center	381 mm
Wheelbase	876.3 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 27, 2026.