Kostenloser Tire Size Rechner
Berechnen Sie tire diameter, circumference, and sidewall Größe aus metric tire size. Compare tire sizes.
Overall Diameter
26.7 in
Overall Diameter vs Tire Width
Formel
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
Lösungsbeispiel
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
Häufig Gestellte Fragen
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.
Lernen