EV tire size changes directly affect ride comfort, wheel diameter, rolling resistance, and even the real driving
speed your EV is traveling compared to what the dashboard shows. Even a small tire size change makes the
speedometer inaccurate resulting in lower efficiency or unexpected range drop.
How tire size affects EV performance
Larger tires increase rolling diameter which increases real speed but reduces acceleration and efficiency,
while smaller tires reduce real speed but improve range under certain conditions. This calculator helps you
check diameter, circumference, and speedometer variation.
Effects of changing tire size
- Changes real driving speed
- Alters speedometer reading accuracy
- Impacts acceleration & braking
- May reduce range due to rolling resistance
- Increases aerodynamic drag for wider tires
When upgrading EV tires
Keep the difference under ±3% to avoid drivetrain stress, incorrect ABS operation, and inaccurate digital
instruments. Some EVs are very sensitive to tire rolling diameter.
Frequently Asked Questions
Q: Does tire size affect EV range?
Yes. Larger wheels usually reduce range due to increased rolling resistance and weight.
Q: Why does my speedometer become wrong?
Speedometers are factory calibrated for the original tire circumference. Changing diameter changes distance per wheel rotation.
Q: How much difference is acceptable?
Preferably under ±3% difference to avoid electronic and drivetrain issues.
Q: Should EVs avoid oversized tires?
Oversized tires can reduce acceleration and range, and increase energy consumption.
Q: Can going smaller improve range?
Possibly yes, but too small causes traction and stability issues and incorrect speed values.
