18 inch rims. . . recommended tire size for drive train?

[midnightgravity]

I'm getting some 18 inch rims. . .what would be the recommended tire size to not over work the drive train? Anyone have any ideas on tires? I'll post pics of rims when I get them.

 

[amrg]

What are you driving? I5 or V8? You can run 35s on both but ur gona feel some lack of power at highway speeds with the I5. Overall Ive ran 35s on both and I feel 33s are the way to go for a 3.5L.