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Originally Posted by mike082802
which is more concave in the arc 8, 18x9 et31 or 18x9.5 et35?
thanks
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Originally Posted by alohasurftoad
They're both the same concavity, profile 3. The 9" has 4mm more material thickness at the hub.
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Originally Posted by mike082802
wouldn't you have to factor in the extra .5" in width as well divided by 2? they are different widths so i didn't know if just using the offsets was advisable.
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Originally Posted by alohasurftoad
they're both profile 3, deep concavity. both faces are low pressure cast in the same mold, the barrels are "flow formed" to the desired width, then the mounting pad is shaved to the desired offset.
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Both the 18x9.5" ET35 and 18x9" ET31 have effectively the same concavity and in terms of appearance, it would be nearly impossible to spot the difference. The wheel pads on all sizes remain the same to allow the OEM hardware to be used in spacer-less applications. It is difficult to directly compare offsets and concavity with differing widths of the wheels in question. It is not a direct comparison and gets to be a little bit complicated. The concavity will change slightly with different offsets as they are made from different molds, however it will be very difficult to notice with the naked eye.
-Ian