Bicycle Archive · Specification report

1999 Diamondback Assault EX

Velopedia Archive ID 89735

Overview

Model year	1999
Brand	Diamondback
Model	Assault EX
Bicycle type	BMX
Archive ID	89735
Original MSRP	$299.99
Colors	Ball-Burnished, Red
Sizes	Pro XL
Weight	27.2 lb

Frameset

Frame construction	TIG-welded
Frame material	6061 T6 aluminum
Fork	Diamondback
Fork material	Chromoly, oversize, unicrown crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	Diamondback 3-piece chromoly, 44 teeth
Bottom bracket	Diamondback
BB shell width	68mm Threadless
Rear cogs	1-speed, 16 teeth
Chain	KMC HP-20, 1/2 x 3/32"
Pedals	Alloy platform

Brakes

Brakes	Tektro linear-pull rear brakes, Lee Chi ProMax rear levers

Cockpit & contact points

Headset	1 1/8" threadless Tioga TG
Handlebar	Diamondback steel
Handlebar extensions	N/A
Stem	Alloy Ahead
Saddle	Padded saddle
Seatpost	Alloy, 27.0mm diameter

Wheels & tires

Hubs	Alloy
Rims	Alloy, double wall, 36-hole
Spokes	Shuhn Lih stainless steel, 2.0mm straight gauge
Spoke nipples	Brass nipples
Front tire	Front: 20 x 1.75" Comp III style, Rear: 20 x 2.125" Comp III style
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	533.4 mm
Head-tube angle	75°
Seat-tube angle	71°
Chainstay / rear center	393.7 mm
Wheelbase	965.2 mm
Fork offset / rake	20 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 29, 2026.