Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Data limitation
No geometry is recorded for 2004 Diamondback Octane 20.
- Data limitation
Only 2003 Diamondback Octane 20 has enough published drivetrain data for gearing calculations.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Gearing unavailable for this size.
Lowest1.43:1Highest2.86:1Total range200%
Estimated speed at 90 RPMLowest gearHighest gear
Uses front tire 20×1.95; rear size isn’t listed.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Complete specification tableShows different published values and gaps where a bicycle lacks data. Different wording reflects source language, not necessarily different components. Swipe for more columns.
Specification
2004 Diamondback Octane 20
2003 Diamondback Octane 20
Overview
Model Year
2004
2003
Brand
Diamondback
Diamondback
Model
Octane 20
Octane 20
Bicycle Type
Juvenile mountain bike, suspension
Juvenile mountain bike, suspension
Original MSRP
$165.00
$164.99
Colors
Black/Red (Boys), Periwinkle/Silver (Girls)
Dog-Gone Berry, Hi-Ho Silver
Sizes
20", Boys and Girls
20" Boys, 20" Girls
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Aluminum
Hi-tensile steel, oversize
Fork
SR Suntour M-2000, 20", 30mm
RST 181 CL, 50mm travel
Fork Material
Aluminum, single crown
Aluminum, single crown
Drivetrain
Component Group
Mountain Mix
Juvenile Mix
Shifters
Shimano Revo, Right Only
Shimano Revo
Rear Derailleur
Shimano Tourney TX-30
Shimano Tourney TY-22
Crankset
OPC w/chainguard
1-piece 5 1/2", 40 teeth
Bottom Bracket
One piece
One piece, one-piece spindle
BB Shell Width
—
American
Rear Cogs
6-speed, 14 - 28 teeth
6-speed, 14 - 28 teeth
Chain
KMC, 1/2 x 3/32"
KMC Z51, 1/2 x 3/32"
Pedals
BMX style resin
Wellgo resin
Brakes
Brakes
Coaster w/aluminum linear-pull rear brakes, resin/aluminum, w/reach adjust rear levers
ProMax linear-pull brakes, Promax alloy levers
Cockpit & Contact Points
Headset
1 1/8" Aheadset
1 1/8" threadless FSA
Handlebar
Jr. ATB Riser
Steel
Handlebar Extensions
Not included
Not included
Stem
Alloy, adjustable rise
Steel
Saddle
DB Jr. ATB Padded
Padded saddle
Seatpost
Steel Post
Aluminum, 25.6mm diameter
Wheels & Tires
Hubs
Front: Steel, nutted, Rear: steel, coaster brake
Steel, nutted
Rims
Alloy MTB, 36-hole
Alex aluminum, 36-hole
Spokes
UCP, 14ga. (2.0mm) straight gauge
UCP, 14ga. (2.0mm) straight gauge
Spoke Nipples
—
Brass nipples
Front Tire
20 x 2.00" Jr ATB
20 x 1.95" Kenda K-850
Wheel Size
20" wheels
20" wheels
Geometry · choose a size for each bicycle
Geometry size
—
Head-tube angle
—
70°
Seat-tube angle
—
71°
Chainstay / rear center
—
381 mm
Wheelbase
—
883.9 mm
Fork offset / rake
—
38.1 mm
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run. Legacy reference geometry is model-level historical data whose corresponding frame size is not identified; compare those dimensions as reference values rather than size-normalized fit data.