Bob774455

Should I expect any issues by increasing wheel/tire size on my 2016 F150 XLT from 275/65R18 to 275/55R20? Have a 2.7V6, 3.55 rear axle, and FX4 Off-road package. Just wondering about potential impact on performance, tire wear, gas mileage, etc.

Kingofwylietx

Those combinations are the same outside diameter.
You won't have any trouble.
I just went from 275/55R20 to 275/60R20.
You may want to consider the same unless you are intentionally wanting to stay with factory sizes.

Cool tool here, it's a tire size comparison....check it out! https://tiresize.com/calculator/


That will let you play with different sizes!

Bob774455

Plenty of clearance for the increased aspect ratio?

blkZ28spt

They are basically the same size.

https://tiresize.com/comparison/ <--please use this website, which was already provided above

What you are changing to actually shows as 0.2" shorter but that is a tiny amount

idrive

iTrader: (3)

The only real potential impact on performance would be if your 20" rims and tires weigh more than your stock configuration. Adding 10 lbs of additional weight on each corner will cost you approx. 1+ mpg.

Kingofwylietx

If you are asking about me going from an aspect ratio of 55 to 60, yes. There is plenty of clearance. The factory 20” is a 32” tire and the ones I went to with the 60 aspect ratio are 33” tires.

The Boz

Your speedometer will be slightly off. Anytime you change the size of your tires, your speedometer will need to be recalibrated to the new size.

jrhooper1963

Yes indeed the speedometer and odometer will be "slightly" off". Also, the transmission shifting points are "influenced" by the amount of revolutions the tire makes. The only way to make the switch from 18" wheels to 20" wheels correctly, is to go into the "brain" of the truck and reprogram it to the new wheel size. Also, when you move up to the 20" wheel size, the truck will not handle bumps as well, because you will be riding on less rubber. Less rubber equals stiffer suspension.

blkZ28spt

Not exactly or necessarily true. You can switch wheel size without switching tire circumference/diameter/revs per mile. OP is talking about tires with a nominal height difference of 0.2" and 3 revs per mile. Literally wearing down the tread on a set of tires is a bigger difference than that. Nothing need be changed in the 'brain'

Starquestbd22

As has been said, I would go with the 275/60/20. Give yourself a little more sidewall and height. No issues with rubbing. I swapped from 275/65/18 to 275/60/20 on my 13 and didn’t change anything else and never had an issue. My 17 came with 20s but I quickly swapped the OEM 275/55/20 Hankooks for 275/60/20 Falkens. Again, no issues.