Bicycle Archive · Specification report

1998 Diamondback Assault EX

Velopedia Archive ID 70792

Overview

Model year	1998
Brand	Diamondback
Model	Assault EX
Bicycle type	BMX
Archive ID	70792
Original MSRP	$250.00
Colors	Ball-burnished, white w/chrome-plated fork
Sizes	Pro XL

Frameset

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

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	Diamondback, 44 teeth
Bottom bracket	Victor VPB-35
BB shell width	American 24tpi
Rear cogs	1-speed, 16 teeth
Chain	KMC HP-20, 1/2 x 1/8"
Pedals	Platform, aluminum

Brakes

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

Cockpit & contact points

Headset	1" YST 252
Handlebar	Diamondback MX-40
Handlebar extensions	N/A
Stem	Diamondback aluminum
Saddle	Diamondback padded
Seatpost	Lee Chi SP-294, 27.0mm diameter

Wheels & tires

Hubs	King Kong aluminum, nutted
Rims	Kin Lin RT-6n, 36-hole
Spokes	Chung Nan steel, 2.0mm straight gauge
Spoke nipples	Brass nipples
Front tire	Front: 20 x 2.125" Comp III style, Rear: 20 x 1.75" 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	967.7 mm
Fork offset / rake	30.5 mm

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