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Originally Posted by Juday
Yes, those will fit just fine under there with no modifications. Stock size (on my '06) is 285/70/17. Seeing as how your 285/65/18 would be skinnier, they will work just fine.
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285 is the width measurement...they will fit fine on a stock Titan, but not because they are skinnier.
In metric sizes, the first number is the width (in mm), the second number is a percentage sidewall based on the first number, and we all know what the last number is...
Its confusing because of the different units of measurement.
285/70/17 is 11.2 inches wide with 7.85 inches of sidewall, for an overall height of 7.85" x 2 + 17 = 32.7"
285/65/18 is 11.2 inches wide with 7.3 inches of sidewall, for an overall height of 7.3" x 2 + 18 = 32.6"
Hope this help!