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I thought the original tire was a 155SR15 which I understand has an aspect ratio of 80% (a 155/80SR15 tire).
I would expect (and you probably expected) the speedo with the 185/65 to be within about 1% of the 155 original.
Unimportant math follows.
Sidewall for the 185 x .65 is 120.25. Twice sidewall is 240.5
Sidewall for the original 155 x .8 is 124. Twice sidewall is 248.
15 in wheel is 381 mm in height.
185/65 overall diameter is 621.5 mm
155/80 overall diameter is 629.0 mm
621.5/629 is .988%
posted by 128.190.22...
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