 |
RPM = (S × Sr × Pc × G × 88.00) ÷ (Tc × Sf × Pm) Speed = (RPM × Tc × Sf × Pm) ÷ (Sr × Pc × G × 88.00) |
|
| S | Speed (miles per hour) | |
| RPM | Engine revolutions per minute | |
| Sr | Rear sprocket tooth count, secondary drive | |
| Pc | Clutch sprocket tooth count, primary drive | |
| G | Gear ratio | |
| Tc | Circumference of rear tire: (diameter (ft.) X 3.1416) Typical tire is 25” in diameter Example: 2.083ft. (25”) X 3.1416 = 6.54ft. |
|
| Sf | Front pulley/sprocket tooth count (tranny output, secondary drive) |
|
| Pm | Motor sprocket tooth count, primary drive | |