Calchy.
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
  1. 01225/40R18: sidewall 90.0 mm, total diameter 637.2 mm
  2. 02235/35R19: sidewall 82.3 mm, total diameter 647.1 mm
  3. 03Difference: 9.9 mm (1.55% — speedometer error in same direction)
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