275/70 R18 on stock suspension

[NoDak Fx4]

New to the forum. I may have missed it but I had a hard time finding this answer before I tried it, so here it is. I picked up my first Expedition Max today. I upsized to 275/70 18 T/A KO2s before I took delivery. They seem to have enough room to not have any issues. I'll definitely update if I get any rubbing.

2021 Max Fx4

 

[newusername]

looks good - i'm running the same size duratracs on mine for the winter.

 

[sanman28]

Good taste

 

[BlueMax21]

Does the FX4 sit any higher than the standard 4 wheel drive Max?

 

[Expedition Dave]

Does the FX4 sit any higher than the standard 4 wheel drive Max?

No. Probably sits lower with the few extra bits of tinfoil underarmor lol.

 

[Knut]

Use the calculators on this site to see how everything compares to stock.
Speed, Revolution per mile, gear ratio, offsets, etc.

Tire Size Comparison

Tire size comparison the easy way. Use our tire size comparison calculator to compare diameter, width, sidewall, circumference and revolutions per mile.

tiresize.com

 

[Knut]

I changed mine from stock 275/65-R18 to 275/55-R20 XL

 

[Lugnut]

I am looking at doing the same size (no lift) on my FX4 Max. Any rubbing or other issues you have noticed w/ the larger rubber? How is road noise w/ the KO2s on the highway?

 

[PNWExpy]

I am looking at doing the same size (no lift) on my FX4 Max. Any rubbing or other issues you have noticed w/ the larger rubber? How is road noise w/ the KO2s on the highway?

I have a 2020 FX4 on stock suspension and just put my old 275/70/18 KO2s on to see how it looks. These wheels are +18 offset and there’s no rubbing at all. When turning it’s a bit snug (would be difficult to fit a hand in there) but even with the tires stuffed it’s all good.

As for road noise and feel, big difference from stock. These have about 20,000 on them and I’ve got a small hum. Not loud enough to be a bother. The extra weight of the KO2 definitely makes the truck a bit more sluggish. Cruising in normal mode (low rpm driving with mpg in mind) seems closer to eco mode now. During Hard exceleration there is no difference. Actually it almost feels faster. They absorb small bumps better too

 

[username]

I changed mine from stock 275/65-R18 to 275/55-R20 XL

How did that affect ride quality and handling? I just bought an Expedition Max XLT and was considering going to up 20" wheels as an option in the future.