FORMULAS:
Tire Height = Wheel Diameter + (2 x (Section Width / 25.4) X (Aspect Ratio / 100))
Rollout = Tire Height X PI
Wheel Rpm = (Vehicle Speed / 60) X (5280 / (Rollout / 12))
Engine Rpm = Wheel Rpm x Rear Gear Ratio x Transmission Gear Ratio

EXAMPLE TIRE SIZE: **100/90-18**
100 |
Section Width |
Total width of the tire at the sidewalls in millimeters. This is measured from the outside of the sides of the tires when mounted and not the tread or rim width. |

90 |
Aspect Ratio |
Percentage of the section width that is the sidewall height. For example the 215mm section width multiplied by an aspect ratio of 40 gives a sidewall height of 86mm |

18 |
Wheel Diameter |
Wheel diameter at the tire mounting surface in inches. |

OLD TIRE SIZING: **3.25-19 or 4.00-18**

3.25 |
Section Width |
Total width of the tire at the sidewalls in millimetersinches. Not sure yet how this is mearured. |

19 |
Wheel Diameter |
Wheel diameter at the tire mounting surface in inches. |

Sidewall Width | ** ** |
| ** ** |
Angle of incline force (lbs) | ** ** |

Tire Height | ** ** |
| ** ** |
Rolling resistance (lbs) | ** ** |

Rollout | ** ** |
| ** ** |
| ** ** |

Gear Ratio | ** ** |
| ** ** |
| ** ** |

Max mph | ** ** |
| ** ** |
| ** ** |