Tire Size Calculator — 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**
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.
- Sidewall = 225 x 55/100 = 123.75 mm = 4.87 in
- Overall diameter = 17 + 2 x 4.87 = 26.74 in
- Circumference = 26.74 x 3.1416 = 84.0 in
- Revolutions per mile = 63,360 / 84.0 = 754