Quote:
Originally Posted by BYprodriver
Are your rear tires shorter than stock ?
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I have stock tires and rims that match the documentation on the car, however probably some variances in speedo readings and then add in the BS factor
![Big Grin](http://www.986forum.com/forums/images/smilies/biggrin.gif)
adds at 15 MPH
So divide speedo reading by the BS factor you now have a ball park estimate of your fastest speed!