Calchy.
Automotive - tire size

What is the difference between 265/35R18 and 285/30R19 tires?

Answer
+10.9
mm overall diameter
653.6 mm − 642.7 mm = 10.9 mm (1.70%)
How we got there
  1. 01265/35R18: sidewall 92.8 mm, total diameter 642.7 mm
  2. 02285/30R19: sidewall 85.5 mm, total diameter 653.6 mm
  3. 03Difference: 10.9 mm (1.70% — speedometer error in same direction)
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