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post #1 of 5 (permalink) Old 02-12-2019 Thread Starter
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275/40/20

I was shopping around and found a really good deal on some brand new tires.

Wanted to know will there be enough clearance for 275/40/20ís on the front and the rear and if anyone else has this set up?

Thanks

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post #2 of 5 (permalink) Old 02-12-2019
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I don't know the answer, but that is a pretty tall tire . . . to get a rough idea how much bigger it is than original, you can look up the diameter of your original tires and those new tires on any of the on-line sources like Tire Rack. I'm guessing you can get away with a tire that is about 1" taller (tire outer diameter) than the originals; but the added width will make it more critical.

What width wheels do you have? While you're in Tire Rack looking up the diameter, check the recommended wheel rim width also; generally for 275 tires you want a 9.5" wheel ; can probably get away with 9" wheel but you won't get full performance from the tire (see tire manufacturer's recommendations)


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post #3 of 5 (permalink) Old 02-12-2019
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That tire is roughly 1 and a half inches taller than OEM sizes (different OEM wheel packages have slightly different overall heights, so don't know what yours is exactly). A 1 and a half inch taller tire will raise your car 3/4 of an inch and is enough to change your overall gear ratio too.

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post #4 of 5 (permalink) Old 02-25-2019 Thread Starter
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JBert and Old Goat Ninja thanks for the info. I currently have 235/50/18ís.
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post #5 of 5 (permalink) Old 02-25-2019
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Quote:
Originally Posted by coop View Post
JBert and Old Goat Ninja thanks for the info. I currently have 235/50/18ís.
So you will need new wheels to go with those tires; and they should be at least 9.5" or better yet 10" wide. I don't know what price you found on the tires, but I'd suggest you look at the total cost for the wheels, tires, and TPMS sensors.

Regarding the tires, here is info I found for you on Tire Rack:

235/50R18 example (you'll get better information if you look up your exact tires, but this should be fairly close)
https://www.tirerack.com/tires/tires...omCompare1=yes
diameter = 27.3", which is typical of the "normal standard factory tires" on these cars

275/40R20 example (same make/model as above for comparison; again you should look up the exact tires you are considering, but this will be very close)
https://www.tirerack.com/tires/tires...omCompare1=yes
diameter = 28.7" ; which is just about 1-1/2" taller than the originals, like we guessed earlier
measuring rim width is 9.5" ; rim width range 9-11" . . . you really want your wheels to be the measuring width or wider

If your car is not lowered, I think they will probably clear, but not sure. A while back I learned that Ford still engineers these cars with enough clearance for tire chains, and I assume that is still the case . . . but I really don't know for sure if those tires, which are both tall and wide, will clear.

Also the speedometer will be off a bit if not recallibrated -- you will be going a bit faster than the speedometer says

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