VelopediaBicycle Archive · Specification report

1998 GT Mach One (02)

Velopedia Archive ID 71299

Overview

Model year1998
BrandGT
ModelMach One (02)
Bicycle typeBMX
Archive ID71299
Original MSRP$279.00
ColorsBlack, red
SizesPro

Frameset

Frame constructionTIG-welded
Frame material4130 chromoly
ForkGT
Fork materialChromoly, unicrown crown
Rear shockN/A

Drivetrain

Component groupN/A
ShiftersN/A
Front derailleurN/A
Rear derailleurN/A
CranksetGT 1-piece chromoly, 43 teeth
BB shell widthAmerican
Rear cogs1-speed, 16 teeth
Chain1/2 x 1/8"
PedalsGT aluminum platforms

Brakes

BrakesTektro linear-pull rear brakes, Tektro levers

Cockpit & contact points

Headset1 1/8" threadless Aheadset SE-1
HandlebarGT Low Pro
Handlebar extensionsN/A
StemGT Piston
SaddleGT Drop Nose
SeatpostGT aluminum micro-adjust

Wheels & tires

HubsGT Mohawk
RimsWeinmann Zac 4019
SpokesSteel, 2.0mm straight gauge
Front tireFront: 20 x 2.125" GT AA Pro, Rear: 20 x 1.75" GT AA Pro
Wheel size20" wheels

Geometry · Legacy reference

Top tube508 mm
Head-tube angle73°
Seat-tube angle70°
Chainstay / rear center374.6 mm
Wheelbase950 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 9, 2026.