tire size

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Aug 1, 2008 | 12:12 PM

66f-100

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Joined: Apr 2008

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From: Montpelier, VA

tire size

Anyone know the correct tire size in modern dimensions for a 66 F-100? Mine obviously doesn't have the correct size tires on it.

Thanks

Aug 1, 2008 | 06:51 PM

85e150

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The factory tire in 1966 was probably something like an 8.15 x 15 2 ply, 4 ply rating car tire. (or maybe 8.45s) Almost everything in those days was undersize tire wise.

225 70 x 15 or 235 70 x 15 or similar would be a decent substitute. You will also find these in 75 aspect ratios. And in LT load ratings too, methinks.

You can check tire diameter vs. metric size here, 4th calculator down:

Novak Conversions - Gearing & Gearing Math for Jeeps

Aug 1, 2008 | 11:14 PM

Dan Edick

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From: El Cajon,San Diego, CA

im not sure about the rubber, but the metal was either 15 x 8 or 15 x 10 on a 5 x 5 1/2 bolt circle

Aug 2, 2008 | 10:45 PM

85e150

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15x8 or 15x10? In '66? Uhh, no.

15 x 5.5, maybe 15 x 6.

I would go out on a limb here and say Ford never offered a 15x8 or 15x10 on any truck, and probably never on any car either, to this day. (15x7 into the '90s then the diameters went up to 16 & 17 & beyond.