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 2002 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.
Lowest1.18:1Highest2.54:1Total range215%
Estimated speed at 90 RPMLowest gearHighest gear
Uses front tire 20×1.95; rear size isn’t listed.
Gearing unavailable for this size.
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
2002 Diamondback Octane 20
2004 Diamondback Octane 20
Overview
Model Year
2002
2004
Brand
Diamondback
Diamondback
Model
Octane 20
Octane 20
Bicycle Type
Juvenile mountain bike, suspension
Juvenile mountain bike, suspension
Original MSRP
$179.99
$165.00
Colors
Black, Blue
Black/Red (Boys), Periwinkle/Silver (Girls)
Sizes
20" Boys, 20" Girls
20", Boys and Girls
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Hi-tensile steel, oversize
Aluminum
Fork
RST 181 CL, 2.4" travel
SR Suntour M-2000, 20", 30mm
Fork Material
Hi-tensile steel, oversize, single triple-clamp crown
Aluminum, single crown
Drivetrain
Component Group
Juvenile Mix
Mountain Mix
Shifters
Shimano Revo
Shimano Revo, Right Only
Rear Derailleur
Shimano Tourney TY-22
Shimano Tourney TX-30
Crankset
1-piece 5 1/2", 33 teeth
OPC w/chainguard
Bottom Bracket
Sealed cartridge, one-piece spindle
One piece
BB Shell Width
American
—
Rear Cogs
6-speed, 13 - 28 teeth
6-speed, 14 - 28 teeth
Chain
KMC Z-51, 1/2 x 3/32"
KMC, 1/2 x 3/32"
Pedals
Wellgo resin
BMX style resin
Brakes
Brakes
Aluminum linear-pull brakes, aluminum linear-pull levers
Coaster w/aluminum linear-pull rear brakes, resin/aluminum, w/reach adjust rear levers
Cockpit & Contact Points
Headset
1" steel
1 1/8" Aheadset
Handlebar
Steel, 30mm rise
Jr. ATB Riser
Handlebar Extensions
Not included
Not included
Stem
Steel
Alloy, adjustable rise
Saddle
Avenir Jr MTB
DB Jr. ATB Padded
Seatpost
Aluminum, 25.6mm diameter
Steel Post
Wheels & Tires
Hubs
Steel, nutted
Front: Steel, nutted, Rear: steel, coaster brake
Rims
Weinmann CN-520, 36-hole
Alloy MTB, 36-hole
Spokes
Chung Nan UCP, 14ga. (2.0mm) straight gauge
UCP, 14ga. (2.0mm) straight gauge
Spoke Nipples
Brass nipples
—
Front Tire
20 x 1.95" Kenda K-850
20 x 2.00" Jr ATB
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.