Quote:
Originally Posted by skyl4rk
These were the numbers with the original 185/65/14 tires.
40 mph -> 2000 rpm
50 mph -> 2500 rpm
60 mph -> 3000 rpm
70 mph -> 3500 rpm
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Compare to the 185/75/14 new tires:
40 mph -> 1837 rpm
50 mph -> 2325 rpm
60 mph -> 2762 rpm
70 mph -> 3250 rpm
In each case, between 7% and 9% difference in rpm.
The original speed data were taken looking at the speedometer, the new data from the Scangauge mph readout, after having calibrated the speed +9% using a gps speedometer.