Bicycle Archive · Specification report

2003 Diamondback Viper

Velopedia Archive ID 39385

Overview

Model year	2003
Brand	Diamondback
Model	Viper
Bicycle type	BMX
Archive ID	39385
Original MSRP	$129.99
Colors	Murk/Silver, Rockstar Red
Sizes	Expert

Frameset

Frame construction	TIG-welded
Frame material	Hi-tensile steel
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	1-piece 175mm, 44 teeth
Bottom bracket	Steel
BB shell width	American
Rear cogs	1-speed, 16 teeth
Chain	KMC, 1/2 x 1/8"
Pedals	Wellgo resin

Brakes

Brakes	ProMax linear-pull rear brakes, Promax alloy rear levers

Cockpit & contact points

Headset	1 1/8" threadless FSA
Handlebar	Chromoly BMX
Handlebar extensions	N/A
Stem	Aluminum
Saddle	Diamondback Padded
Seatpost	Steel, 25.4mm diameter

Wheels & tires

Hubs	Steel
Rims	Aluminum, 36-hole
Spokes	Stainless steel, 14ga. (2.0mm) straight gauge
Spoke nipples	Brass nipples
Front tire	Front: 20 x 2.125" Kenda K-905, Rear: 20 x 1.95" Kenda K-905
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	520.7 mm
Head-tube angle	74°
Seat-tube angle	71°
Chainstay / rear center	386.1 mm
Wheelbase	957.6 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.