Bicycle Archive · Specification report

2003 Diamondback Octane 20

Velopedia Archive ID 39381

Overview

Model year	2003
Brand	Diamondback
Model	Octane 20
Bicycle type	Juvenile mountain bike, suspension
Archive ID	39381
Original MSRP	$164.99
Colors	Dog-Gone Berry, Hi-Ho Silver
Sizes	20" Boys, 20" Girls

Frameset

Frame construction	TIG-welded
Frame material	Hi-tensile steel, oversize
Fork	RST 181 CL, 50mm travel
Fork material	Aluminum, single crown
Rear shock	N/A

Drivetrain

Component group	Juvenile Mix
Shifters	Shimano Revo
Front derailleur	N/A
Rear derailleur	Shimano Tourney TY-22
Crankset	1-piece 5 1/2", 40 teeth
Bottom bracket	One piece, one-piece spindle
BB shell width	American
Rear cogs	6-speed, 14 - 28 teeth
Chain	KMC Z51, 1/2 x 3/32"
Pedals	Wellgo resin

Brakes

Brakes	ProMax linear-pull brakes, Promax alloy levers

Cockpit & contact points

Headset	1 1/8" threadless FSA
Handlebar	Steel
Handlebar extensions	Not included
Stem	Steel
Saddle	Padded saddle
Seatpost	Aluminum, 25.6mm diameter

Wheels & tires

Hubs	Steel, nutted
Rims	Alex aluminum, 36-hole
Spokes	UCP, 14ga. (2.0mm) straight gauge
Spoke nipples	Brass nipples
Front tire	20 x 1.95" Kenda K-850
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	464.8 mm
Head-tube angle	70°
Seat-tube angle	71°
Chainstay / rear center	381 mm
Wheelbase	883.9 mm
Fork offset / rake	38.1 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 28, 2026.