Bicycle Archive · Specification report

2003 Diamondback Jr. Viper

Velopedia Archive ID 30038

Overview

Model year	2003
Brand	Diamondback
Model	Jr. Viper
Bicycle type	BMX
Archive ID	30038
Original MSRP	$109.99
Colors	Blue Flame, Chrome-Plated
Sizes	Pro

Frameset

Frame construction	TIG-welded
Frame material	Hi-tensile steel
Fork material	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	1-piece 5 1/2", 36 teeth
Bottom bracket	Steel
Rear cogs	1-speed, 18 teeth
Chain	KMC Z410, 1/2 x 1/8"
Pedals	Resin

Brakes

Brakes	Steel linear-pull rear brakes, aluminum rear levers

Cockpit & contact points

Headset	1" steel
Handlebar	Steel BMX
Handlebar extensions	N/A
Stem	Aluminum 4 bolt
Saddle	Diamondback BMX
Seatpost	Steel, chrome plated, 25.4mm diameter

Wheels & tires

Hubs	Front: steel, nutted, Rear: steel, coaster brake
Rims	Steel, 36-hole
Spokes	Stainless steel, 14ga. (2.0mm) straight gauge
Spoke nipples	Brass nipples
Front tire	20 x 1.75" Kenda K-50
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	488.9 mm
Head-tube angle	71°
Seat-tube angle	69°
Chainstay / rear center	374.6 mm
Wheelbase	894.1 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 28, 2026.