93Cobra#2771 -
Quote:
Originally Posted by 93Cobra#2771
carlos - you did go for a wider tire. A 195/65/15 is 10 mm wider than the stock 185/65/15 and slightly taller as you found.
What have you found in your mileage comparisons so far?
I'm wondering if the decreased deflection/ heat generation will cancel out any loss from the slightly wider tire? 10mm is less than 1/2" from sidewall to sidewall.
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Thanks for catching that! I will post that on the thread as a negative. I will calculate the added frontal area. I am thinking it will be in the range of :
2 (tires) * 0.39(10mm / 25.4 = inches) * 6 (to 8 inches of exposed tire)
There will also be a horizontal increase in exposed tire area because the tire is slightly taller.
My main conclusion is based on the GPS/odometer correction. In my
fuel logs I document a +2% distance correction from what my odometer is reading. I would suggest that whatever tire you get, you do a GPS before/after comparison. That will give you conclusive evidence as to what the gain is,
Caveat: I didn't think to do a GPS before test, so there is the
possibility that my odometer was already -2% before the new tires.
CarloSW2