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I have a 2014 RAV4 Limited.
I am looking for new tires after 50,000 miles.
I want to change from 235/55R18 to 255/55R18
Does anyone know of any downside to increasing from 235 to 255?
 

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This will most definitely decrease gas mileage due to heavier tire and bigger diameter. Also that will affect performance, but not by much. Probably not even noticeable. But on the bright side - ride will be better, more meat :)
 

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You're changing your rolling circumference by about 8% if my math is correct. Generally not a great idea.
 

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It will probably slightly increase actual gas mileage. It will reduce apparent mileage.
It will make your mileage warranty last longer.
It will increase the odds of getting a speeding ticket.
It will reduce acceleration.
It will interfere with putting chains on your tires.
 

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Based on GEOLANDAR G055™ - tires installed on my RAV4

255 v 235

Diameter difference is 0.7 inches.. maybe will affect speedometer by 1 mph - no worries about speed difference.

Weight difference - 255s are 6 lbs heavier - will lower MPG for sure.. donno how much lower, maybe 1mpg, maybe more, but i wouldn`t say it will be something drastic. For reference, when i had Corolla, i installed 2 sizes up tires, MPG decreased by 1.5, roughly.

Width - 225s 1" wider. Good for dry surface.. maybe decrease of traction on wet (puddles) or snowy/icy roads.

But again, nothing major that should scare you, if you want to do it, do it. I know i will when tires are due for replacement. Will go 2 sizes up for sure.
 

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Up a size

I also have a similar question. How would going up one size to 245-50R18 change?

I'm just looking for a little more aggressive stance.
 
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