I have 2014 F150 V6 Ecoboost. I want to change tire size. I have 275/65R18 now and want to go up in size, to a 285/75R18. When changing size will if affect any of my parameters? If so what effects will it have?

 

parameters?

It will cause your speedometer and odometer to be off. 35s might rub without a lift and some trimming. And your total gear ratio will be changed with the bigger tires.

 

The tires you are considering are about 3" taller and 1" wider. You can play around with this website and get a feel for about how much it will throw the speedometer and gear ratio off.

It'll throw speedo off by about 10% and if you have 3.55 gears now you'll effectively have 3.22's after.

That wouldn't be acceptable to me, without paying to regear and probably a lift.

I ended up going with 265/70/18's. They are about 1/2" taller and 1/2" narrower than factory. Not enough difference in the speedo or power to notice. I like a taller narrower tire for off roading anyway. It gives me a little extra margin to run chains as well. 275/75/18's would net me about .7" more ground clearance. The greater cost of the tires, lift, regearing, recalibrating the speedo, and loss of fuel mileage simply aren't worth .7" of ground clearance to me.

 

I do believe they will rub, but you can check here to see if that combo will work.
https://www.customwheeloffset.com/wh...gallery?page=1