🛞 Size 1
How does the tire & wheel size calculator work?
The calculator estimates the overall wheel diameter using: rim diameter + 2×tire sidewall height. Based on that, it calculates circumference, ground clearance change, and speedometer error.
This helps you understand whether an alternative size is reasonable and how it may affect handling, ride height, and speed readings.
What does the result show?
You’ll see diameter difference in percent, ground clearance change in millimeters, and the real speed when your speedometer shows 100 km/h.
FAQ
What diameter difference is acceptable?
A common recommendation is to stay within ±2% to avoid issues with ABS/ESP and ground clearance.
Why does the speedometer reading change?
The speedometer depends on wheel circumference. If the circumference is larger, your real speed will be higher than the indicated speed.