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I had 235/85R16's on the front of my C-30, mounted up on later 16"x6.5" GM steel wheels. They worked fine, although the left front rubbed the sidewall on the steering box a little at max cut, IIRC.

Those tires later came apart (they were real old; I shouldn't have messed with them to begin with), so I went with some 245/75R16's on the front, keeping the taller 235/85R16 MT tires on the rears.

Hope this helps!