Bicycle Archive · Specification report

2004 Diamondback Reactor Expert

Velopedia Archive ID 31721

Overview

Model year	2004
Brand	Diamondback
Model	Reactor Expert
Bicycle type	BMX
Archive ID	31721
Original MSRP	$275.00
Colors	Super Nickel
Sizes	20"

Frameset

Frame construction	TIG-welded
Frame material	7005 aluminum
Fork	RMX Pro
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, 44 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	DB Bigfoot, alloy platform

Brakes

Brakes	Tektro alloy rear brakes, Tektro rear levers

Cockpit & contact points

Headset	1 1/8" FSA
Handlebar	RMX CrMo
Handlebar extensions	N/A
Stem	RMX cnc, aluminum
Saddle	RMX padded
Seatpost	Aluminum micro-adjust, 26.8mm diameter

Wheels & tires

Hubs	Sealed mechanism
Rims	Alex 7X23F, 36-hole
Front tire	20 x 1.75" Tioga Comp III
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	495.3 mm
Head-tube angle	73°
Seat-tube angle	71°
Chainstay / rear center	388.6 mm

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