Ratio2.75:1
Estimated speed At 90 RPM
Gear
Rear tire: 20×1.95.
Velopedia Bicycle Archive
2004 Diamondback Viper X
Original specifications: 20" wheels · legacy reference geometry.
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At a glance
Archive #31726- Model year
- 2004
- Category
- BMX
- Original MSRP
- $165.00
- Sizes
- 20"
- Colors
- Flat Black, Super Nickel
- Geometry
- Legacy reference
- In this record
- 22 specifications · archived image · original MSRP · geometry
Model history 10 other years
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Identification clues
2004 archived details
- Published colors
- Flat Black, Super Nickel
- Frame
- Chromoly
- Original equipment
- N/A
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildChromoly · 20" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | Chromoly |
| Fork | Diamondback |
| Fork Material | Hi-tensile steel, unicrown crown |
Drivetrain
| Crankset | 1-piece 175mm, 44 teeth |
|---|---|
| Bottom Bracket | Loose ball |
| BB Shell Width | American |
| Rear Cogs | 1-speed, 16 teeth |
| Chain | KMC Z410, 1/2 x 1/8" |
| Pedals | Resin, platform |
Brakes
| Brakes | Rush U-Brake, w/detangler rear brakes, aluminum rear levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" threadless FSA |
|---|---|
| Handlebar | DB Riser |
| Stem | Aluminum |
| Saddle | Padded |
| Seatpost | Steel, 25.4mm diameter |
Wheels & Tires
| Hubs | Aluminum |
|---|---|
| Rims | Alex C303, 36-hole |
| Spoke Nipples | Brass nipples |
| Front Tire | 20 x 2.125" DB Knobby |
| Rear Tire | 20 x 1.95" DB Knobby |
| Wheel Size | 20" wheels |
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Geometry
Historical measurements. Frame size unknown.
Reference drawing
Size
Measurement
Measurement
—
Select an available measurement to locate it on the frame.
All geometry measurementsLegacy reference · 6 measurements
| Measurement | Legacy reference |
|---|---|
| Top tube | 520.7 mm |
| Head-tube angle | 74° |
| Seat-tube angle | 71° |
| Chainstay / rear center | 387.3 mm |
| Wheelbase | 957.6 mm |
| Fork offset / rake | 30.5 mm |
Frame size not recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
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.
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
Steel
25.4mm diameter
Alex C303
36-hole
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
- Front: 20 x 2.125" DB Knobby, Rear: 20 x 1.95" DB Knobby
- Drivetrain
- 1-speed
- Seatpost diameter
- 25.4 mm
- Bottom bracket / shell
- Loose ball · American
Equipment inspection checks 10 checks based on 5 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: Diamondback · Hi-tensile steel, unicrown crown
Drivetrain
Check drivetrain wear →Archived: Crankset: 1-piece 175mm, 44 teeth · Bottom bracket: Loose ball · Rear cogs: 1-speed, 16 teeth · Chain: KMC Z410, 1/2 x 1/8"
Brakes
Inspect the brakes →Archived: Brakes: Rush U-Brake, w/detangler rear brakes, aluminum rear levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Alex C303, 36-hole · Hubs: Aluminum · Front tire: Front: 20 x 2.125" DB Knobby, Rear: 20 x 1.95" DB Knobby
Controls and contact points
Archived: Headset: 1 1/8" threadless FSA · Handlebar: DB Riser · Stem: Aluminum · Seatpost: Steel, 25.4mm diameter · Saddle: Padded · Pedals: Resin, platform
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.