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My RPM chart shows a 3.91 with a 29 inch tire about the same as a 3.73 with a 28 inch tire. when you talk about width are you thinking tread width or section width? I run 275 on my AAR with 3.91s and I am pleased with them. 
The tire size calculator that I used described section width, I thought that was another term for tread width. At any rate, the tires on the orange car are narrower and I kinda like it.
The M/T Ls are supposed to be a 275.60 but they look wider when I compare them to pictures of cars with the metric tire. I DO have rubbing problems with the M/Ts on an 8" rim.
1972 Cuda 340 4 speed, 2001 Ram CTD 4x4 6 speed, 1970 Duster 408 4 speed, 1996 Ram 5.9 2x4 auto, 1965 Coronet 500
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