Ratio2.75:1
Estimated speed At 90 RPM
Gear
Rear tire: 20×1.75.
Velopedia Bicycle Archive
2001 Diamondback RM20
Original specifications: 20" wheels · legacy reference geometry.
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At a glance
Archive #36052- Model year
- 2001
- Category
- BMX
- Original MSRP
- $549.99
- Sizes
- Pro XL
- Colors
- Team Scheme
- Geometry
- Legacy reference
- In this record
- 21 specifications · archived image · original MSRP · geometry
Model history 3 other years
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Identification clues
2001 archived details
- Published colors
- Team Scheme
- Frame
- 7005 aluminum
- Original equipment
- N/A
Clues, not proof of model year. Colors vary and components may have been replaced.
Original build7005 aluminum · 20" wheels
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | 7005 aluminum |
| Fork | Diamondback RMX |
| Fork Material | Chromoly, unicrown crown |
Drivetrain
| Crankset | 3-piece chromoly 180mm, 44 teeth |
|---|---|
| Bottom Bracket | Sealed cartridge |
| Rear Cogs | 1-speed, 16 teeth |
| Chain | KMC HP-20, 1/2 x 3/32" |
| Pedals | Aluminum platform |
Brakes
| Brakes | Tektro BX-20 linear-pull rear brakes, Tektro 311A rear levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" threadless Cane Creek SX-1 |
|---|---|
| Handlebar | Chromoly BMX |
| Handlebar Extensions | Not included |
| Stem | Aluminum |
| Saddle | RMX padded |
| Seatpost | Aluminum micro-adjust, 27.0mm diameter |
Wheels & Tires
| Hubs | RMX aluminum sealed bearing |
|---|---|
| Rims | Alex AL-DM24, 36-hole |
| Front Tire | 20 x 2.125" Tioga Comp III |
| Rear Tire | 20 x 1.75" Tioga Comp III |
| Wheel Size | 20" wheels |
No specifications match. Try a component name or clear your search.
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 · 4 measurements
| Measurement | Legacy reference |
|---|---|
| Top tube | 539.8 mm |
| Head-tube angle | 73.5° |
| Seat-tube angle | 71° |
| Chainstay / rear center | 393.7 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
Tektro BX-20 linear-pull rear brakes
Tektro 311A rear levers
Aluminum micro-adjust
27.0mm diameter
1 1/8" threadless Cane Creek SX-1
More parts (1)Fewer parts
Alex AL-DM24
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" Tioga Comp III, Rear: 20 x 1.75" Tioga Comp III
- Drivetrain
- 1-speed
- Seatpost diameter
- 27 mm
- Bottom bracket / shell
- Sealed cartridge
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 RMX · Chromoly, unicrown crown
Drivetrain
Check drivetrain wear →Archived: Crankset: 3-piece chromoly 180mm, 44 teeth · Bottom bracket: Sealed cartridge · Rear cogs: 1-speed, 16 teeth · Chain: KMC HP-20, 1/2 x 3/32"
Brakes
Inspect the brakes →Archived: Brakes: Tektro BX-20 linear-pull rear brakes, Tektro 311A rear levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Alex AL-DM24, 36-hole · Hubs: RMX aluminum sealed bearing · Front tire: Front: 20 x 2.125" Tioga Comp III, Rear: 20 x 1.75" Tioga Comp III
Controls and contact points
Archived: Headset: 1 1/8" threadless Cane Creek SX-1 · Handlebar: Chromoly BMX · Stem: Aluminum · Seatpost: Aluminum micro-adjust, 27.0mm diameter · Saddle: RMX padded · Pedals: Aluminum platform
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