Calcolatore Misura Pneumatici
Confronta le misure degli pneumatici e calcola le differenze di diametro e circonferenza.
Overall Diameter
26.7 in
Overall Diameter vs Tire Width
Formula
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
Esempio Risolto
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
Domande Frequenti
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.
Impara