Bicycle Archive · Specification report

2008 GT Mach One Jr.

Velopedia Archive ID 13939

Overview

Model year	2008
Brand	GT
Model	Mach One Jr.
Bicycle type	BMX
Archive ID	13939
Original MSRP	$139.99
Colors	Blue
Sizes	One size fits all

Frameset

Frame construction	TIG-welded
Fork	GT BMX
Fork material	Unicrown
Rear shock	N/A

Drivetrain

Component group	BMX
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	GT Forged steel 1pc.
Bottom bracket	Steel, ball type
Rear cogs	1-speed
Chain	KMC Z-410
Pedals	Jr. BMX design, resin

Cockpit & contact points

Headset	1" steel
Handlebar	GT BMX
Handlebar extensions	Not included
Stem	Steel
Saddle	GT JR. BMX
Seatpost	Steel

Wheels & tires

Hubs	Front: steel, Rear: Steel coaster
Rims	Alloy, 28-hole
Spokes	14ga. (2.0mm)
Spoke nipples	Brass
Front tire	16 x 2.125"
Wheel size	16" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 6, 2026.