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post #1 of 13 (permalink) Old 02-03-2010, 10:16 AM Thread Starter
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xr7 tire size

I bought some xr7 wheels and i want to buy some tires off e-bay
what size should i get

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post #2 of 13 (permalink) Old 02-03-2010, 10:43 AM
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If they are 16", (IMHO) the best size is 235 60 16. Slightly larger than stock, doesn't throw off the speedo (I've found it usually read closer to accurate since the stock setup usually reads fast), fill up the wheel wells nicely, and are a common size, so prices are pretty good.

Can't help you if they are 15's, and of course just my opinion.

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post #3 of 13 (permalink) Old 02-03-2010, 11:07 AM
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235 60 16 is what i had
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post #4 of 13 (permalink) Old 02-03-2010, 11:57 AM
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As was stated, 235/60/16 will work. Stock size is 225/60/16, and you could also go for some 245/55/16 if you want something a little wider.

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post #5 of 13 (permalink) Old 02-03-2010, 12:10 PM
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when I had 16's on my bird, I ran 245/50/16's.

had a real nice look to it.

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post #6 of 13 (permalink) Old 02-03-2010, 12:18 PM
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If they are 15" they are 215/70R15



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post #7 of 13 (permalink) Old 02-03-2010, 12:40 PM
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Quote:
Originally Posted by 94 Daily Driven 4.6L View Post
If they are 16", (IMHO) the best size is 235 60 16. Slightly larger than stock, doesn't throw off the speedo (I've found it usually read closer to accurate since the stock setup usually reads fast), fill up the wheel wells nicely, and are a common size, so prices are pretty good.

Can't help you if they are 15's, and of course just my opinion.
How can a 235/60R16 tire make the speedometer on a Thunderbird/Cougar more accurate when that tire has a larger outside diameter than the 225/60R16 tires that Ford originally put on those cars with 16" wheels? Both the speedometer and the vehicle speed sensor were calibrated for the OE size tires and I don't see how changing to a different size tire than stock would make anything on the car more accurate!

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post #8 of 13 (permalink) Old 02-03-2010, 01:21 PM
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UNcalibrated speedometers

FWIW, I've noticed on most cars the speedos read slightly higher than actual speed. I don't know why that is except maybe the auto manufacturers would rather err on the high side as opposed to the low side where a lawsuit is more likely. If you have a cop friend or access to a radar gun (even those you see set up on the side of the road sometimes), check yours out.
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post #9 of 13 (permalink) Old 02-03-2010, 02:01 PM
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if you have a gps with a speedo on it you can check. My bird reads 2.5 mph faster than actually is going

Spinning pies like wheels.

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post #10 of 13 (permalink) Old 02-03-2010, 03:10 PM Thread Starter
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will a 255/50R16 fit the rear?

Quote:
  • "Chuck Norris built my shortblock. It runs on the tears of small children and makes 10,000 hp. He said it's his 'street version' "
wheel hoppin and poppin!
91 Thunderbird sport 357W 5speed
88 stripped out 5.0 C4 and 4:56 gears in a 9in Ford


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post #11 of 13 (permalink) Old 02-03-2010, 03:29 PM
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Quote:
Originally Posted by winkysrides View Post
will a 255/50R16 fit the rear?
a 255/55/16 fits just fine.


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post #12 of 13 (permalink) Old 02-05-2010, 08:31 AM
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There are several Tyre Size Calculators on the internet. Here are just two of them

http://www.tiresizecalculator.info/
http://www.tyresave.co.uk/tyresize.html

just add your size and let the computor do the calculations. Then you see how much bigger or smaller they are.

Berth
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post #13 of 13 (permalink) Old 02-05-2010, 08:57 AM
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i have a 1991 cougar LS but i want to put bigger tires on the back, what should i use?

91 Cougar 4.0/ Bored Out 30, Dump Off, Sway Bars.
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