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Old 01-14-2016, 09:16 AM   #1
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Tires and different sizes

Out of curiosity if I do a staggered setup I know the back tires could be slightly taller or shorter than the fronts. Will this cause any problems for the computer and the assists or is there some room for difference. Any help is appreciated. I'm trying to avoid getting a tuner just to adjust for tire size. Also can ford make the tire size adjustments if needed?


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Old 01-15-2016, 07:59 AM   #2
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Anyone?


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Old 01-15-2016, 05:29 PM   #3
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Anyone?


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Well since you insist!
From everything I've seen on the subject so far, a small difference between front and back, shouldn't make much difference.
I have never owned a tuner but I am under the impression that it would only be used to correct for a speed difference as a result of rear wheel size change. Not for front wheels.
As far as the rear wheel sizes, many references refer to maintaining a maximum of plus or minus 3% difference. That's a mere 1.8 MPH difference at 60 MPH.
I would venture to say for a correction to wheel size changes that Ford could make the correction, if found necessary.
What are you talking about as far as original tire size vs. new tire sizes?
As pointed out by a Ford service mgr in a recent thread, there has to be a certain amount of slop to account for different wheel speeds, when cornering and such.
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Old 01-15-2016, 08:35 PM   #4
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Stock fronts and 295/40/18's out back


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Old 01-16-2016, 10:30 AM   #5
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Not a big deal if speedo is off by a couple
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Old 01-16-2016, 11:03 AM   #6
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Stock fronts and 295/40/18's out back


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Well I assume the stocks are 235/50-18 which are about 27.3" dia.
and the 295/40-18 are also about 27.3 dia.

Am I missing something here??
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Old 01-16-2016, 11:04 AM   #7
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Not a big deal if speedo is off by a couple
percent
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Old 01-16-2016, 12:26 PM   #8
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I had a 14 TrakPak and went from the stock 255/40/19's in the rear to 285/35/20's which is about 2.59" more circumference and .82" more height and never had an issue...............although the speedometer will be off by maybe a couple of miles per hour I don't think you'll have an issue.
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Old 01-16-2016, 02:10 PM   #9
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Well I assume the stocks are 235/50-18 which are about 27.3" dia.
and the 295/40-18 are also about 27.3 dia.

Am I missing something here??

That setup is different by a tenth I think. I was curious just because I was also thinking about going 285 and I would need to swap the fronts to get a similar height or the rears would be shorter. I'm not used to all of these fancy electronics the last mustang before this was a '98 and I don't think the computer was quite so sophisticated.


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Old 01-16-2016, 04:42 PM   #10
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That setup is different by a tenth I think. I was curious just because I was also thinking about going 285 and I would need to swap the fronts to get a similar height or the rears would be shorter. I'm not used to all of these fancy electronics the last mustang before this was a '98 and I don't think the computer was quite so sophisticated.


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Keep in mind that the formulas and charts give you close approximations of tire diameters based on width, profile and rim size. Different manufactures will vary somewhat.
Regarding 285's, they're are still well within the recommended max of 3% dia difference. They're like 1% smaller.
Either way you wouldn't have to change your front tire size.
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Old 01-16-2016, 05:07 PM   #11
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I'm having New 275x40x17 put on the Rear & 245x45x17 put on the Front this Tuesday.
(Tire Shop had to order my tires....Only had 3 in stock). I had planned to put 235x45x17 on Front but the Tire Shop Guy said the 235's matched with 275's would be a little too narrow & the Traction wouldn't be so good & it could cause some slight pulling. He recommended 245's which were only $10 more ea.
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