Tire Aspect Ratio Calculator
Calculate tire aspect ratio, overall diameter, revolutions per mile, and sidewall height with our comprehensive calculator. Determine correct tire sizing and compatibility for your vehicle.
Step 1: Tire Specifications
Understanding Tire Aspect Ratio
The aspect ratio is the height of the tire’s sidewall expressed as a percentage of the tire’s width. For example, a 225/55R17 tire has an aspect ratio of 55%, meaning the sidewall height is 55% of 225mm.
Step 2: Calculation Parameters
About Tire Calculations
Tire calculations help ensure proper fitment, maintain accurate speedometer readings, and optimize vehicle performance. Always verify tire compatibility with your vehicle’s specifications.
Tire Calculation Results
Overall Tire Diameter
Tire Size Comparison Table
| Tire Size | Overall Diameter | Sidewall Height | Revs per Mile |
|---|
Tire Dimension Breakdown
Tire Calculation Formulas
Overall Diameter = (Tire Width × Aspect Ratio × 2 / 1000) + (Wheel Diameter × 25.4)
To calculate tire diameter: Multiply tire width by aspect ratio (as decimal), multiply by 2, divide by 1000 to get meters, then convert wheel diameter from inches to mm and add together, finally convert back to inches.
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