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.
- Gearing
2002 Diamondback Octane 20 has a 18% lower climbing ratio than 2003 Diamondback Octane 20.
A lower ratio gives more mechanical advantage; rear-wheel rollout determines distance per crank turn.
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.
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
2002 Diamondback Octane 20
2003 Diamondback Octane 20
Overview
Model Year
2002
2003
Brand
Diamondback
Diamondback
Model
Octane 20
Octane 20
Bicycle Type
Juvenile mountain bike, suspension
Juvenile mountain bike, suspension
Original MSRP
$179.99
$164.99
Colors
Black, Blue
Dog-Gone Berry, Hi-Ho Silver
Sizes
20" Boys, 20" Girls
20" Boys, 20" Girls
Weight
—
—
Frameset
Frame Construction
TIG-welded
TIG-welded
Frame Material
Hi-tensile steel, oversize
Hi-tensile steel, oversize
Fork
RST 181 CL, 2.4" travel
RST 181 CL, 50mm travel
Fork Material
Hi-tensile steel, oversize, single triple-clamp crown
Aluminum, single crown
Drivetrain
Component Group
Juvenile Mix
Juvenile Mix
Shifters
Shimano Revo
Shimano Revo
Rear Derailleur
Shimano Tourney TY-22
Shimano Tourney TY-22
Crankset
1-piece 5 1/2", 33 teeth
1-piece 5 1/2", 40 teeth
Bottom Bracket
Sealed cartridge, one-piece spindle
One piece, one-piece spindle
BB Shell Width
American
American
Rear Cogs
6-speed, 13 - 28 teeth
6-speed, 14 - 28 teeth
Chain
KMC Z-51, 1/2 x 3/32"
KMC Z51, 1/2 x 3/32"
Pedals
Wellgo resin
Wellgo resin
Brakes
Brakes
Aluminum linear-pull brakes, aluminum linear-pull levers
ProMax linear-pull brakes, Promax alloy levers
Cockpit & Contact Points
Headset
1" steel
1 1/8" threadless FSA
Handlebar
Steel, 30mm rise
Steel
Handlebar Extensions
Not included
Not included
Stem
Steel
Steel
Saddle
Avenir Jr MTB
Padded saddle
Seatpost
Aluminum, 25.6mm diameter
Aluminum, 25.6mm diameter
Wheels & Tires
Hubs
Steel, nutted
Steel, nutted
Rims
Weinmann CN-520, 36-hole
Alex aluminum, 36-hole
Spokes
Chung Nan UCP, 14ga. (2.0mm) straight gauge
UCP, 14ga. (2.0mm) straight gauge
Spoke Nipples
Brass nipples
Brass nipples
Front Tire
20 x 1.95" Kenda K-850
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°
70°
Seat-tube angle
71°
71°
Chainstay / rear center
381 mm
381 mm
Wheelbase
883.9 mm
883.9 mm
Fork offset / rake
38.1 mm
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.