Hello all, any insights on this issue?
My 2020 Limited is currently sitting on those 22" polished fancy rims with nice slick summer tires that ain't particularly good for our icy roads here in Ontario Canada specially during this current winter months.
I'm looking to maybe get the smaller size 20" rims used out of a Lariat Sport model and throw in some new winter tires. Would the downsizing cause any damage since it came originally with 22"? The door sticker says 22"and the spare 18" only doesn't mention the 20" although I know it also came with the Lariat trim.
Also if getting those 20" are the bolt patterns the same as the 22"

Thanks for all the help!

 

All the trucks from 2004 to 2024 use the same bolt pattern (unless its one of the weird 7 lug HDPP models). You can run lariat or platinum 20's, the overall tire diameter should be close enough to not throw off the speedometer. I've run platinum 20's on a XLT that came with 17's without any issues, hell I currently have raptor 17's on my platinum that came with 20's.

For tire cost you'd be better stepping down to an 18 or 17 for a winter set IMO.

 

I haven't thought about 18" yet, Big thanks!
Do I have to do any mods with Forscan for the 4HI or 4AT to work properly or doesn't make difference?

 

Four things come to mind.
All 4 should be the same size for 4wd use.
Speed indicating will be off a noticeable amount.
The programs that deal with wheel speed and trans shifting >may< generate some code or cause some difference..
The spare being 18", put on any corner, is only for temporary short distance and time, till flat can be addressed.
Best to select 4 new tires to fit traction needs for the longer term instead of having to fool with it repeatedly over the long term.
If not being done, the tires should be rotated every time changed, to get the most out of a set.
Good luck.
.

 

Wheel diameter has nothing to do with tire diameter. OEM 4X4 tire/wheel combo is typically about 32" diameter, give or take a little. So for a given wheel diameter you just choose a tire that is about 32" in diameter and nothing will be significantly affected (such as speedometer). The 18" OEM takeoffs I just swapped to my 2015 have 275/65R18 tires. The math works out to a diameter of 32.07" for them. OEM 20" wheels have 275/55R20 tires, which works out to 31.91" diameter.

 

As long as the overall diameter is the same or very very close to OEM, its not going to make a difference. The truck has no way to know if you are running 24's or 18's as long as the over tire diameter is the same is OEM...

 

Factory 22" tire size: P275/45R22, overall diameter 31.8"
Factory 20" tire size: 275/55R20, overall diameter 31.9"
Factory 18" tire size: 275/65R18, overall diameter 32.1"

Any factory tire will be very close. If you compare your speedo to a GPS speedo and find some error, it can be corrected using Forscan.

 

I can't tell - are you recommending a single set of tires for all seasons?

 

You can also correct for different tire diameters with a hand held device that is much easier to use than getting into Forscan. The downside is they run around $200

 

Tire size and wheel size are 2 different things. You can get the same overall diameter tire with 15", 16", 17", 18", 20" or 22" wheels. Or at least within a fraction of an inch. Bigger wheels just mean less rubber between the road and wheel. That's good for aggressive driving on pavement. Smaller wheels mean more rubber between the road and wheel. They tend to ride better and perform better off-road. But will cause more body lean when cornering aggressively.

Unless you change to a tire size 2-4" different there is no need to worry about the accuracy of the speedometer or odometer.