johnpagenola

Yes. Your tire + wheel has a smaller diameter so you tach higher at the same speed. Details:

2005+ Mustang RPMs in Gear 5 of a Manual Transmission (0.68)
Wheel=18 Section=285 Ratio=40 Diameter=26.98 Revs per mile=748 -----------------------------

Axle MPH=55 MPH=60 MPH=65 MPH=70 MPH=75 MPH=80 MPH=85

3.31 1,543 1,683 1,823 1,963 2,103 2,244 2,384
3.55 1,654 1,805 1,955 2,106 2,256 2,406 2,557
3.73 1,738 1,896 2,054 2,212 2,370 2,528 2,686
3.90 1,817 1,983 2,148 2,313 2,478 2,644 2,809
4.10 1,911 2,084 2,258 2,432 2,605 2,779 2,953
4.30 2,004 2,186 2,368 2,550 2,733 2,915 3,097

Margarita Girl

Thanks. I love to learn new things on the interweb.[sm=smiley20.gif]

grampa_stang

Here's a spreadsheet that does all the conversions. Download it and change it from a .txt to .xls.
Then we can leave poor John alone.