Moving from my 2013 Expedition to a 2015 this month and suspect you guys have more experience, any issues (ABS, computer, etc ) moving to a tire .9" to 1" taller than stock? Thanks

 

Can't offer anything about going to a 2015, but since 2006, I have upsized my tires by about an inch in diameter and have never had any issues. This is based on a 2007 Lariat, 2011 FX4 and my current 2013 FX4.

 

I'm getting ready to upgrade from a 235 series to a 265 series which is between .7" to 1" taller and my local dealer said that nothing needed to be done as it isn't a big change.

Now, is your question more related to electronic adjustments or body leveling adjustments?

 

Depending upon if the aspect ratio decreases (e.g. 70 > 55), or the tire rating changes (e.g. P > LT), etc. ...

• speedometer will be off by ~4% (too slow). *odometer will be off and unless there is compensation calculating MPG will be askew (e.g. PCM flash).
  .
• rolling resistance will increase. *less MPG
  .
• wheels (rims+tires) will be heavier. *less MPG

There may be (?) more but those the ones that 1st come to mind.

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-click- the pic'
Goth 150
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Concerned with ECU, ABS, and other electronic issues. Thanks

 

Can't answer specifically for the Expedition, but I just put new tires on my 2011 F150.
Went from the stock - approximately 32 inch tire to Yokohama Geolander at a fraction under 33 inches. Couple things I noticed right off. The mpg's get slightly lower fuel mileage indication. Not really lower because the tire is slightly taller which results in less revolution/miles indicated over the tank of gas. Seems to show about 1/2 mpg. The only other issue I noticed (probably seat of the pants gut feel) was slightly more body roll during turns. This may be due to deeper tread depth and softer compound tires than the original. Again, this was just my personal butt feel.
Getting away from the OEM tire, mine are quieter and have better traction. An inch is no issue. enjoy.

 

I upgraded from a stock Goodyear 275/65/18 to a 285/60/20, with Duratraks, when turning very hard left, the driver front tire barely rubbed on the inside plastic splash gaurd, i trimmed it about 1/2 inch and all is well...If i would have stayed with the 275, probably wouldn't have rubbed at all. Mileage changed from 18.3 to 18.2

 

Go here Tire Size Calculator - Compare Two Sizes
Put in your existing tire size and put in desired new tire size. It can make a difference. Your Transmission Control Module (TCM) is sensitive to tire size. It makes a difference in shifting.
I noticed it when I changed tires to a slightly smaller size. If I was going about 30 and slowed to almost a stop then applied the accelerator just slightly. I would get a harsh shift. It was hanging in third and then jumping down to first when applying the gas no matter how gently. A TCM adjustment fixed the problem.

 

I just upgraded to a 275/70/18 Cooper Discover AT3 10 ply, it's about 1.2" taller than stock. The Speedo is dead on from 0-110 (more accurate than stock) & mpg has not changed. Second best thing I have changed. 1st was custom tunes from 5 Star Tuning!!!

 

Additional info to consider (thanks to SeventySevenF250) are weight of the new tires and rolling resistance *better traction for mud/snow). Both of those will have an impact on city driving mileage.