17 inch rims and tires are the standard available on the XLT / or XTR 2010 F150.
When I went to the FX4, it automatically changes the tires to 18's
I just want to know if there is any issue putting 17" rims and tires on it for winter.
No issues what so ever with 17's. I ordered the plain jane OEM 17's from my parts guy at the dealership and then threw on a set of Michelin X-Ice's to protect my summer wheels/tires.
You simply adjust the size and aspect ratio of the tire to compensate for the smaller wheel, and there is no adjustment/worry about recalibrating the speedo. Maintain the same rolling diameter, and the computer doesn't care what's on there, and your speed indication is still 100% accurate. (There's online calculators that will crunch the numbers for you)
Talking my '09 FX4 here - swapped out the 275/65/R18's and alloy wheels for 265/70/R17's with steel wheels form Ford. (Cheap, and no worries on how they fit)
The tire pressure monitor sensor's from Ford have dropped in price to like $50 a corner, so it's worth it to throw a set in and not be bothered with the trouble code, or dash light.
The dealer mounts the new tire/wheels and then essentially goes around to all four corners with a hand held unit, and uses it to tie them in with the on-board.
It's a bit of an investment up-front, but worth it I think if you average the cost of swapping tires, balancing etc, over the four or five years you'll use them.
Plus, after driving with all-seasons, and then snows, there is just no substitute for four good snows, regardless of where you live.