Tire Size Calculator
Calculate the overall diameter, circumference, and sidewall height from a metric tire size.
Overall Diameter
26.7 in
Overall Diameter vs Tire Width
सूत्र
## How to Read a Tire Size A tire marked 225/55R17 means: 225 mm width, 55% aspect ratio (sidewall height as % of width), R = radial, 17-inch rim. ### Formula **Sidewall = Width x Aspect Ratio / 100 (in mm)** **Overall Diameter = Rim Diameter + 2 x Sidewall (converted to inches)** **Circumference = Diameter x pi**
हल किया गया उदाहरण
Tire size 225/55R17.
- 01Sidewall = 225 x 55/100 = 123.75 mm = 4.87 in
- 02Overall diameter = 17 + 2 x 4.87 = 26.74 in
- 03Circumference = 26.74 x 3.1416 = 84.0 in
- 04Revolutions per mile = 63,360 / 84.0 = 754
अक्सर पूछे जाने वाले प्रश्न
What does the aspect ratio mean?
The aspect ratio is the sidewall height as a percentage of the tire width. A 55 aspect ratio on a 225mm tire means the sidewall is 123.75mm tall.
Can I change tire sizes?
You can change within about 3% of the original overall diameter. Larger changes affect speedometer accuracy, clearance, and handling.
Why does tire circumference matter?
Tire circumference directly affects speedometer readings and odometer accuracy. A different circumference means your speedometer will read incorrectly.
सीखें