Automotive - tire size
What is the difference between 225/40R18 and 235/35R19 tires?
Answer
+9.9
mm overall diameter
647.1 mm − 637.2 mm = 9.9 mm (1.55%)
How we got there
- 01225/40R18: sidewall 90.0 mm, total diameter 637.2 mm
- 02235/35R19: sidewall 82.3 mm, total diameter 647.1 mm
- 03Difference: 9.9 mm (1.55% — speedometer error in same direction)
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