Quote:
Originally Posted by flip4335
The speedo reads 60mph with the taller tire, but the car will actually be going 61 mph, compared to the smaller tire.
Hope that makes sense.
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Well, I agree with some of what you said and also think some of it is factually inaccurate. Nevertheless, read my post carefully. The TireRack calculator says that with the taller tire mounted, the speedo will say 61 when the car is really going 60. Not vice versa like you say it should (and I agree with).
My thinking is that, essentially, the car will cover more distance per revolution of the axle on the taller tires, therfore making it go more miles per hour than the shorter tire when the axles are spinning at identical RPM's. Hence, with taller tires (or a larger overall diameter) the speedo should read 60 when the car is really doing 61. Please tell me how I am wrong here.