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post #1 of 5 (permalink) Old 11-20-2007, 10:03 PM Thread Starter
 
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Good at math?

So if my Bird has a stock tire size of 215/70-15 with a diameter of 26.9 inches (or 751 revolutions per mile) and my rear end ratio is 3.27:1 ....

and I put on 245/45-16 tires with a diameter of 24.7 inches (or 817 revolutions per mile)...

What would my rear net ratio then be?

yes I know it's still a 3:27, but the rpms will be higher at any given speed due to the smaller tires.. so would they be the same as running 3.55's with stock size? 3.73's??

Anyone get what I'm saying?

Thanks~
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post #2 of 5 (permalink) Old 11-20-2007, 10:36 PM
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751/817= 0.92
3.27/0.92=3.56

keep in mind it will look bad and lower the car by half the difference, over an inch.




Matt "Looks Like Egon" Davis
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post #3 of 5 (permalink) Old 11-22-2007, 09:03 AM
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hmm that is interesting, i just relized my tires are taller than stock, can you tell me what my gear ratio would be with the stock 94 differential? tire size is 235 70
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post #4 of 5 (permalink) Old 11-22-2007, 09:47 AM
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27.95/26.85=1.041
3.08/1.041=2.96




Matt "Looks Like Egon" Davis
96 Alpine Green V8
98 Audi A8 4.2Q in Racing Green Totalled
02 Audi A8L 4.2Q in Black

I buy my OEM Ford parts at 10% over dealer cost from Steve in White Bear Lake, MN.
You drive "like a man possessed"... by a woman!
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post #5 of 5 (permalink) Old 11-22-2007, 08:02 PM Thread Starter
 
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Thanks GreenBird..

These are the wheels and tires I bought pictured on the sellers car.. I think they will do fine till it's time for rubber replacement and then I'll step up to the correct size~




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