Calchy.
Automotive - tire size

What is the difference between 185/60R15 and 195/50R15 tires?

Answer
-27.0
mm overall diameter
576.0 mm − 603.0 mm = -27.0 mm (-4.48%)
How we got there
  1. 01185/60R15: sidewall 111.0 mm, total diameter 603.0 mm
  2. 02195/50R15: sidewall 97.5 mm, total diameter 576.0 mm
  3. 03Difference: -27.0 mm (-4.48% — speedometer error in same direction)
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