Calchy.
Automotive - tire size

What is the difference between 205/55R16 and 225/45R17 tires?

Answer
+2.4
mm overall diameter
634.3 mm − 631.9 mm = 2.4 mm (0.38%)
How we got there
  1. 01205/55R16: sidewall 112.8 mm, total diameter 631.9 mm
  2. 02225/45R17: sidewall 101.3 mm, total diameter 634.3 mm
  3. 03Difference: 2.4 mm (0.38% — speedometer error in same direction)
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