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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.
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.
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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