On the factory dually rims, my crew cab & chassis, I'm using Cooper 7.50-16LT SRM all around. Had no problems when it was a flat bed. They are 31.80 inch diameter. When I went to a fleetside bed, I had to add a 2" suspension lift out back because of inner wheel housing rub.
http://67-72chevytrucks.com/vboard/s...6&postcount=21
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John
1984 C30 Chevy Crew Cab Dually
1998 Jeep Cherokee 4x4
2004 Chevy Trailblazer 4x4 (wife's)
1970 Mustang FB fully tubed (getting 521 BBF & powerglide)
1978 Nova 2dr (going BBCaddy & S.P. th400)
1984 Monte SS (circle track car)
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