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Actual milage variation 275/70/18 vs 275/65/18

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Hey guys, I wanted to see if anyone knows how the smaller tire will affect my actual milage vs recorded milage on the odometer. I have a Pro-4x so my factory tires were 275/70/18. I came across a set of 275/65/18 for a really good price. Anyone know what the difference would be at about 3k miles? Thanks in advance.
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Difference is 3.3%, so when your odo says you've gone 3,000 miles on the smaller tires your speedo would have read 2901 on the other tires. You're making the odo read more miles for the same actual distance traveled.

You sure your OEM are 275/70/18 and not 265/70/18?

Here's a link to a tire size calulator you might find useful.
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Discussion Starter · #3 ·
Yeah, Pro-4x stockers are 275/70/18. I have 275/60/20 right now. Thanks for the quick and accurate response Carbeaux
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