Is this right? edit: nothing to see here

"Agrajag" (Agrajag) 11/03/2013 at 17:32 • Filed to: hunh?

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8

http://www.1010tires.com/Tools/Tire-Siz…

I had assumed rim diameter and sidewall height would be an indicator of overall diameter. According to this the 255-70r15 is over 1.5" taller than stock tire.

edit:

Thanks.

lonestranger > Agrajag 11/03/2013 at 17:45

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Sounds right to me. Aspect ratio (the "70" in 255/70R 15) is not constant. It is the percentage of the section width (70% of 255mm in this case). So, tires of different widths yet similar overall diameters ans circumferences will have different aspect ratios.

dogisbadob > Agrajag 11/03/2013 at 17:50

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Apparently anything more than a 3% difference causes brake failure? dafuq?

Rim diameter and sidewall height *are* an indicator of overall diameter

.70 x 255/25.4 + 15
or
.70 x 255 +15x25.4

The sidewall height is 70% of 255 mm

Agrajag > lonestranger 11/03/2013 at 17:51

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Never mind, I'm an ass. If I'd fully read the chart I would've figured it out.

Lumpy44, Proprietor Of Fine Gif > Agrajag 11/03/2013 at 17:53

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Looks right to me. I have 235-75r15 on my Sonoma. 255 are way taller/rub the wheel wells

lonestranger > Agrajag 11/03/2013 at 17:54

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If you're looking for a 255-width tire with roughly the same overall diameter as a 225/70 tire, you need a 255/60.

Agrajag > dogisbadob 11/03/2013 at 17:56

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Yeah that was news to me, but so was the second # being a percentage. I always just thought it was a metric measurement of sidewall height.

dogisbadob > Agrajag 11/03/2013 at 18:08

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well it is, kind of :p

Dunnik > Agrajag 11/03/2013 at 18:54

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