225/45R17 vs 235/45R18
Switching from 225/45R17 to 235/45R18 increases your tire's overall diameter by 5.4% (from 24.97" to 26.33"). At an indicated 60 mph, your actual speed would be about 63.3 mph.
225/45R17
Current- Overall diameter
- 24.97"
- Circumference
- 78.45"
- Sidewall height
- 3.99"
- Revolutions
- 808 /mile
235/45R18
New- Overall diameter
- 26.33" (+5.4%)
- Circumference
- 82.71" (+5.4%)
- Sidewall height
- 4.16"
- Revolutions
- 766 /mile