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Tire Sizes
#1
The attached spreadsheet is set up so that anyone can enter a tire size and get the approximate diameter, widths, and recommended rim width.  Axle ratios can also be entered and the engine RPM at 60mph is shown, based on the tire size. The engine RPM can also be entered to check speeds, based on axle ratios and tire sizes.  The second tab shows rear ratios of various Ford transmissions.

NOTE: Added a tab for wheel and tire clearance calculations  5/7/19

.xlsx   Tire Sizes-v5.xlsx (Size: 618.68 KB / Downloads: 56)

.xls   Tire Sizes-v5.xls (Size: 689 KB / Downloads: 25)

Because changing tire diameters will affect speedometer accuracy you can find information and a speedometer gear calculator here:
https://www.7173mustangs.com/thread-spee...#pid163384



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#2
Thank you guys for all the inputs! Big Grin I have decided to go with the 3.50 gears, as long as the pinion was 28 splines. He was unsure and going to check today.
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#3
I added a tab to the spreadsheet (Clearances) that will make it easy to calculate the distances between the inside and outside edges of the rims and tires for measuring and estimating the clearances from springs, fenders, etc.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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