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stupid tire question

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Old Sep 14, 2012 | 03:12 PM
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205/75/R15 vs 215/70/R15

What is the difference? The 215 is wider? Which is taller?

Thanks
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Old Sep 14, 2012 | 03:21 PM
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The first section is the width in millimeters, the second is the height of the sidewall from wheel to tread (as a percentage of the width), then obviously the wheel size.

205/75/R15 is 205mm wide, 153.75mm tall to the edge of the wheel.
215/70/R15 is 215mm wide, 150.5mm tall to the edge of the wheel.

A 10mm difference is like .4" or so. So less than half an inch difference in width, and only 6mm difference in total tire height.
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Old Sep 14, 2012 | 03:23 PM
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205 & 215 = width in mm
70 &75 = aspect ratio (sidewall to width in %)
R15 = Radial tire for 15" rim

I hope/think this is correct.
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Old Sep 14, 2012 | 03:25 PM
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so its pretty much, within a few mils, the same tire?
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Old Sep 14, 2012 | 03:46 PM
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Originally Posted by salty_waders
so its pretty much, within a few mils, the same tire?
It varies somewhat by manufacturer, but 215/70's are nominally 26.9" in diameter, and 205/75's are 27.1"; the original 7.75-15's were also 27.1". Not enough difference to affect speedo accuracy.
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Old Sep 14, 2012 | 03:52 PM
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Originally Posted by JohnZ
It varies somewhat by manufacturer, but 215/70's are nominally 26.9" in diameter, and 205/75's are 27.1"; the original 7.75-15's were also 27.1". Not enough difference to affect speedo accuracy.
Perfect...thanks!
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