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Velopedia Bicycle Archive
2004 Diamondback Octane 20
Original specifications: Shimano Tourney · 6-speed · mechanical rear derailleur · 20" wheels.
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At a glance
Archive #31701- Model year
- 2004
- Category
- Kids
- Original MSRP
- $165.00
- Sizes
- 20", Boys and Girls
- Colors
- Black/Red (Boys), Periwinkle/Silver (Girls)
- In this record
- 24 specifications · archived image · original MSRP
Model history 8 other years
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Identification clues
2004 archived details
- Published colors
- Black/Red (Boys), Periwinkle/Silver (Girls)
- Frame
- Aluminum
- Original equipment
- Mountain Mix
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildAluminum · Mountain Mix · 20" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | Aluminum |
| Fork | SR Suntour M-2000, 20", 30mm |
| Fork Material | Aluminum, single crown |
Drivetrain
| Component Group | Mountain Mix |
|---|---|
| Shifters | Shimano Revo, Right Only |
| Rear Derailleur | Shimano Tourney TX-30 |
| Crankset | OPC w/chainguard |
| Bottom Bracket | One piece |
| Rear Cogs | 6-speed, 14 - 28 teeth |
| Chain | KMC, 1/2 x 3/32" |
| Pedals | BMX style resin |
Brakes
| Brakes | Coaster w/aluminum linear-pull rear brakes, resin/aluminum, w/reach adjust rear levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" Aheadset |
|---|---|
| Handlebar | Jr. ATB Riser |
| Handlebar Extensions | Not included |
| Stem | Alloy, adjustable rise |
| Saddle | DB Jr. ATB Padded |
| Seatpost | Steel Post |
Wheels & Tires
| Hubs | Front: Steel, nutted, Rear: steel, coaster brake |
|---|---|
| Rims | Alloy MTB, 36-hole |
| Spokes | UCP, 14ga. (2.0mm) straight gauge |
| Front Tire | 20 x 2.00" Jr ATB |
| Wheel Size | 20" wheels |
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Gearing
Original gearing is incomplete. Enter your setup to calculate ratios and cadence speeds.
Try your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
Find replacement parts
KMC
1/2 x 3/32"
Replacement search: 6-speed bicycle chain Before ordering: Check chain width and length.
20 x 2.00" Jr ATB
Replacement search: 20x2 bicycle tire Before ordering: Check rim type and tire clearance.
Shimano Tourney TX-30
Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.
Parts and service referenceQuick reference before buying parts
Archived specifications for reference. Check the fitted parts before ordering.
- Front tire
- 20 x 2.00" Jr ATB
- Drivetrain
- 6-speed
- Bottom bracket / shell
- One piece
Equipment inspection checks 11 checks based on 6 archived component groups Open equipment checksClose equipment checks
Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.
Full used-bike inspection guide →
Frame and fork
Inspect the frame and fork →Archived: Frame: TIG-welded · Fork: SR Suntour M-2000, 20", 30mm · Aluminum, single crown
Suspension
Evaluate the suspension →Archived: Fork: SR Suntour M-2000, 20", 30mm
Drivetrain
Check drivetrain wear →Archived: Group: Mountain Mix · Shifters: Shimano Revo, Right Only · Rear derailleur: Shimano Tourney TX-30 · Crankset: OPC w/chainguard · Bottom bracket: One piece · Rear cogs: 6-speed, 14 - 28 teeth · Chain: KMC, 1/2 x 3/32"
Brakes
Inspect the brakes →Archived: Brakes: Coaster w/aluminum linear-pull rear brakes, resin/aluminum, w/reach adjust rear levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Alloy MTB, 36-hole · Hubs: Front: Steel, nutted, Rear: steel, coaster brake · Front tire: 20 x 2.00" Jr ATB
Controls and contact points
Archived: Headset: 1 1/8" Aheadset · Handlebar: Jr. ATB Riser · Stem: Alloy, adjustable rise · Seatpost: Steel Post · Saddle: DB Jr. ATB Padded · Pedals: BMX style resin
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.