Automotive - tire size
What is the difference between 225/45R17 and 235/40R18 tires?
Answer
+10.9
mm overall diameter
645.2 mm − 634.3 mm = 10.9 mm (1.72%)
How we got there
- 01225/45R17: sidewall 101.3 mm, total diameter 634.3 mm
- 02235/40R18: sidewall 94.0 mm, total diameter 645.2 mm
- 03Difference: 10.9 mm (1.72% — speedometer error in same direction)
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