Anyone try a tire in 275/55R20?

[lslick23]

My wife’s Ford Expedition has this specific size 275/55R20 and with the giant size of that thing they don’t look bad. I started looking at AT tires in this size and surprised to see them with 117H XL loads and I’m really intrigued by this since my Goodyears are wearing very quickly. Some great examples seem to be the new Toyos OC III’s EV and the Nokian Outpost NAT. Do these translate to our Rivians or are there negatives to this? Thanks for the responses.

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[madhat]

You're losing an inch of overall diameter from the smaller size available (275/60/20), so you're introducing speedometer inaccuracy...a good 3%. Your odometer will be adding 3% more miles than actual plus the speedo will read about 2mph fast at 75.

 

[Eeyore]

Also your range calculations will be off with those smaller tires.

 

[Polar]

Not worth it at all.

 

[yetti96]

You're losing an inch of overall diameter from the smaller size available (275/60/20), so you're introducing speedometer inaccuracy...a good 3%. Your odometer will be adding 3% more miles than actual plus the speedo will read about 2mph fast at 75.

Also your range calculations will be off with those smaller tires.

Can the OP not enter a custom tire size into the relatively new tire and wheel selection tool that's in the truck?

 

[madhat]

Can the OP not enter a custom tire size into the relatively new tire and wheel selection tool that's in the truck?

Last I looked you are only allowed to use factory option sizes, though you can say you have a generic "performance" tire. I'm not so sure if it affects the mileage calculation though...

 

[kanundrum]

I switched to 275/55/20 which imho should be a factory size because it offers more tire selection, better ride quality than 50s, better handling than 60s.

https://www.rivianforums.com/forum/...ate-wheel-tire-combo-help-needed.28284/page-6

 

[HaveBlue]

The stock 20s are 34". Subtracting one inch is a 33" which is what the non AT ones are. Just use one of those configs.

 

[lslick23]

I switched to 275/55/20 which imho should be a factory size because it offers more tire selection, better ride quality than 50s, better handling than 60s.

https://www.rivianforums.com/forum/...ate-wheel-tire-combo-help-needed.28284/page-6

That wheel and tire setup looks great on your truck! Thanks for sharing

 

[madhat]

The stock 20s are 34". Subtracting one inch is a 33" which is what the non AT ones are. Just use one of those configs.

275/60 is the all season size with 33" diameter. They're asking about 275/*55*, which has a diameter of 32"...

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