Tire Sidewall Height Calculator
Calculate the exact vertical height of a tire sidewall using width and aspect ratio. Optimize for ride comfort, handling performance, or aesthetic fitment.
About
The Tire Sidewall Height Calculator is a specialized tool designed for automotive enthusiasts, mechanics, and drivers looking to modify their vehicle's wheel setup. The sidewall height—the distance from the rim to the outer tread is a critical factor in determining both the aesthetic appeal and the dynamic behavior of a vehicle. It is not explicitly stated on the tire in millimeters; rather, it is derived from the aspect ratio relative to the tire's width.
Understanding the sidewall height is essential when changing rim sizes (up-sizing) or selecting tires for specific performance goals. A taller sidewall generally offers better shock absorption and ride comfort, acting as a secondary suspension component. Conversely, a shorter sidewall (low profile) reduces tire flex during cornering, providing sharper steering response and improved handling stability at the cost of ride softness. Incorrect calculations can lead to speedometer errors, rubbing against the wheel well, or potential suspension damage.
Formulas
The sidewall height is calculated as a percentage of the tire's section width. The formula used to determine the vertical height H is:
Where:
- H = Sidewall Height (mm)
- W = Tire Width (mm)
- AR = Aspect Ratio (%)
To convert the result to inches, the value is divided by the standard conversion factor:
Reference Data
| Tire Width (mm) | Aspect Ratio (%) | Sidewall Height (mm) | Sidewall Height (in) | Common Application |
|---|---|---|---|---|
| 195 | 65 | 126.75 | 4.99 | Compact Sedans |
| 205 | 55 | 112.75 | 4.44 | Standard Sedans |
| 225 | 45 | 101.25 | 3.99 | Sports Coupes |
| 245 | 40 | 98.00 | 3.86 | Performance Cars |
| 275 | 35 | 96.25 | 3.79 | Supercars / Rear |
| 265 | 70 | 185.50 | 7.30 | Trucks / SUVs |
| 315 | 75 | 236.25 | 9.30 | Off-Road Vehicles |
| 355 | 25 | 88.75 | 3.49 | Exotic / Custom |