Tire Size Converter
Compare your current and new tire sizes – see the difference, speedometer deviation and recommended alternatives.
Tire Size Converter
Compare your current and new tire sizes – see the difference, speedometer deviation and recommended alternatives.
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Important notes on tire size changes
- ±1% diameter deviation is safe (green zone).
- 1-3% deviation may require technical approval (yellow zone).
- Over 3% is NOT recommended – safety risk (red zone).
- Larger tires may reduce acceleration and increase consumption.
- Always check load index and speed rating too!
Tire size change – what you need to know
When changing tire sizes, it is critical that the new tire has a similar rolling circumference to the original. Too large a deviation causes incorrect speedometer and odometer readings, affects ABS/ESP systems, and may void roadworthiness certification.
The general rule: up to ±1% deviation is safe. Between 1% and 3% requires technical approval (tire-rim documentation). Over 3% is strongly discouraged.
A larger tire increases the diameter, causing the speedometer to read lower and the odometer to count less. A smaller tire has the opposite effect. Also consider width: a wider tire may rub against the wheel arch.
The values shown here are informational. Discrepancies or typos may occur. We accept no liability for errors or damages. The database is continuously expanded and updated.