Bicycle Archive · Specification report

2011 GT Mach One Junior

Velopedia Archive ID 25123

Overview

Model year	2011
Brand	GT
Model	Mach One Junior
Bicycle type	Juvenile
Archive ID	25123
Colors	Black, red

Frameset

Frame construction	Steel
Frame material	Hi Ten
Fork	GT BMX
Rear shock	N/A

Drivetrain

Component group	BMX Mix
Crankset	Forged 1 piece, 32T teeth
Bottom bracket	Steel
Cassette	Cog
Rear cogs	16 teeth
Chain	KMC Z410
Pedals	Jr. BMX design, resin

Cockpit & contact points

Headset	1" steel
Handlebar	GT BMX
Handlebar extensions	Not included
Stem	4-bolt Alloy/Steel Quill
Saddle	GT JR. BMX
Seatpost	Steel, 25.4mm diameter

Wheels & tires

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

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 26, 2026.