Automotive
Compare tyre dimensions, speedometer readings and ground clearance. A size comparison does not confirm a safe fit.
Tyre calculators
Compare tyre dimensions and speedometer differences.
How to pick the right calculator
- Read the sidewall: Enter the complete tyre size.
- Check the ratings: Confirm load and speed ratings separately.
- Confirm the fit: Check rim width, clearance and vehicle requirements.
Frequently asked questions
Does a similar tyre diameter guarantee a safe fit?
No. Rim width, load rating, speed rating, clearance and vehicle requirements also matter. A size comparison does not approve a replacement tyre.
Why does tyre size affect a speedometer?
A change in rolling circumference changes the distance travelled per wheel rotation. The calculator estimates this difference from nominal tyre dimensions.
Are the tyre dimensions exact?
They are calculated from the size markings. Actual dimensions vary with the tyre design, pressure, wear and load.