Bicycle Archive · Specification report

2005 GT Mach One Jr.

Velopedia Archive ID 93636

Overview

Model year	2005
Brand	GT
Model	Mach One Jr.
Bicycle type	BMX
Archive ID	93636
Original MSRP	$139.99
Colors	Speed Red, Chrome

Frameset

Frame construction	TIG-welded
Frame material	Hi-tensile steel
Fork	GT
Fork material	High-tensile steel, unicrown crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	1-piece steel, 36 teeth
Rear cogs	1-speed, 16 teeth
Chain	KMC Z410, 1/2 x 1/8"
Pedals	Resin platform

Brakes

Brakes	Coaster brake rear

Cockpit & contact points

Headset	1" threaded steel
Handlebar	Hi-tensile steel
Stem	Aluminum
Saddle	GT Jr.
Seatpost	Steel, 22.2mm (7/8 inch) diameter

Wheels & tires

Hubs	Front: steel, Rear: Shimano coaster
Rims	Aluminum
Spokes	14ga. (2.0mm) straight gauge
Spoke nipples	Brass nipples
Front tire	16 x 2.125" BMX knobby
Wheel size	16" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 25, 2026.