Ratio2.69:1
Estimated speed At 90 RPM
Gear
Uses front tire 20×2.125; rear size isn’t listed.
Velopedia Bicycle Archive
1997 Research Dynamics Coyote BMX Three
Original specifications: 20" wheels · 23.5 lb published weight · legacy reference geometry.
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No archive photo is available for this record.
At a glance
Archive #62733- Model year
- 1997
- Category
- BMX
- Original MSRP
- $449.00
- Sizes
- Boys 9"
- Colors
- Polished
- Weight
- 23.5 lb
- Geometry
- Legacy reference
- In this record
- 22 specifications · original MSRP · geometry
Original build7005 aluminum · 20" wheels
Frameset
| Frame Construction | Welded |
|---|---|
| Frame Material | 7005 aluminum |
| Fork | Aprebic AX-4602 |
| Fork Material | Chromoly, butted, unicrown crown |
Drivetrain
| Crankset | Cyclone CPI SPR-620, 43 teeth |
|---|---|
| Bottom Bracket | One piece |
| BB Shell Width | 68mm Threadless |
| Rear Cogs | 1-speed, 16 teeth |
| Chain | KMC HP-20, 1/2 x 3/32" |
| Pedals | Fasten NW-221 |
Brakes
| Brakes | Tektro 869A brakes, Tektro RBP-286A levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" threadless Dia-Compe Aheadset SE-1 |
|---|---|
| Handlebar | K W BX-31E0 |
| Stem | Hsin Lung MX-320 |
| Saddle | Velo VL-229 |
| Seatpost | Kalloy SP-263, 31.4 mm diameter |
Wheels & Tires
| Hubs | King Kong 370 |
|---|---|
| Rims | Alex VP-20, 36-hole |
| Spokes | Sha Dar stainless steel, 2.0mm straight gauge |
| Spoke Nipples | Brass nipples |
| Front Tire | 20 x 2.125" Cheng Shin C-714 |
| 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 · 6 measurements
| Measurement | Legacy reference |
|---|---|
| Top tube | 518.2 mm |
| Head-tube angle | 75° |
| Seat-tube angle | 74° |
| Chainstay / rear center | 401.3 mm |
| Wheelbase | 985.5 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
20 x 2.125" Cheng Shin C-714
Replacement search: 20x2.125 bicycle tire Before ordering: Check rim type and tire clearance.
Kalloy SP-263
31.4 mm diameter
Alex VP-20
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
- 20 x 2.125" Cheng Shin C-714
- Drivetrain
- 1-speed
- Seatpost diameter
- 31.4 mm
- Bottom bracket / shell
- One piece · 68mm Threadless
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: Welded · Fork: Aprebic AX-4602 · Chromoly, butted, unicrown crown
Drivetrain
Check drivetrain wear →Archived: Crankset: Cyclone CPI SPR-620, 43 teeth · Bottom bracket: One piece · Rear cogs: 1-speed, 16 teeth · Chain: KMC HP-20, 1/2 x 3/32"
Brakes
Inspect the brakes →Archived: Brakes: Tektro 869A brakes, Tektro RBP-286A levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Alex VP-20, 36-hole · Hubs: King Kong 370 · Front tire: 20 x 2.125" Cheng Shin C-714
Controls and contact points
Archived: Headset: 1 1/8" threadless Dia-Compe Aheadset SE-1 · Handlebar: K W BX-31E0 · Stem: Hsin Lung MX-320 · Seatpost: Kalloy SP-263, 31.4 mm diameter · Saddle: Velo VL-229 · Pedals: Fasten NW-221
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.