Bicycle Archive · Specification report

2004 Diamondback Reactor Jr

Velopedia Archive ID 31722

Overview

Model year	2004
Brand	Diamondback
Model	Reactor Jr
Bicycle type	BMX
Archive ID	31722
Original MSRP	$320.00
Colors	Super Nickel
Sizes	20"

Frameset

Frame construction	TIG-welded
Frame material	6061 T6 aluminum
Fork	RMX Junior
Fork material	CRMO, single crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	Forged alloy, 42 teeth
Bottom bracket	Sealed, tapered spindle
BB shell width	68mm English
Rear cogs	1-speed, 16 teeth
Chain	KMC Z610, 1/2 x 3/32"
Pedals	Aluminum platform

Brakes

Brakes	Tektro alloy rear brakes, Tektro rear levers

Cockpit & contact points

Headset	1" FSA
Handlebar	Jr. Aluminum
Handlebar extensions	N/A
Stem	RMX Jr.
Saddle	UniStyle, padded
Seatpost	Intergrated, 22.2mm diameter

Wheels & tires

Hubs	Sealed mechanism, low flange
Rims	Alex R390, 24-hole/28-hole
Front tire	20 x 1 3/8" Tioga Comp III
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	476.2 mm
Head-tube angle	73°
Seat-tube angle	72°
Chainstay / rear center	368.3 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 28, 2026.