Bicycle Archive · Specification report

1998 Diamondback Reactor Jr.

Velopedia Archive ID 74155

Overview

Model year	1998
Brand	Diamondback
Model	Reactor Jr.
Bicycle type	BMX
Archive ID	74155
Original MSRP	$400.00
Colors	Ball-burnished
Sizes	Junior

Frameset

Frame construction	TIG-welded
Frame material	7005 aluminum
Fork	Diamondback
Fork material	Chromoly, unicrown crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	Diamondback aluminum, 44 teeth
Bottom bracket	YST BB 611NW
BB shell width	American 24tpi
Rear cogs	1-speed, 16 teeth
Chain	Taya TB-400, 1/2 x 1/8"
Pedals	Diamondback aluminum

Brakes

Brakes	Chang Star 500 brakes, Dia-Compe MX-101 levers

Cockpit & contact points

Headset	1" YST aluminum
Handlebar	Diamondback aluminum
Handlebar extensions	N/A
Stem	Diamondback aluminum
Saddle	Diamondback
Seatpost	Diamondback aluminum, 20.4mm diameter

Wheels & tires

Hubs	King Kong Hollow Axle
Rims	Alex aluminum, 32-hole
Spokes	Chung Nan stainless steel, 2.0mm straight gauge
Spoke nipples	Brass nipples
Front tire	20 x 1 3/8" Tioga Comp III
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	467.4 mm
Head-tube angle	73°
Seat-tube angle	68°
Chainstay / rear center	368.3 mm
Wheelbase	866.1 mm
Fork offset / rake	20.1 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 27, 2026.