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I know plenty of guys run 12.50 tires on 8" rims, and I'm not trying to stir anyone up, but...
It's my understanding, and I think most tire people will agree, that a 10" rim width (or 9.75 with 16.5 rims) is the recommended size for a 12.50 tire. A narrower rim will squeeze the sidewalls somewhat and may cause the tread to wear faster in the center. You can ease the situation a bit by running lower air pressure, but that increases fuel consumption. A rim that is too wide or too narrow will also change the handling characteristics of the tire by changing the way the sidewalls flex. An old rule of thumb is the rim width should roughly match the tread width. Some tire companies' websites have recommendations - BFG in particular gives an accepted range of rims for each tire, and their recommended width.
just my .02 :p
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- Mike -
1972 K20 LWB 350/350/205
RIP El Jay
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