With a 17" rim you could run more than 4.5" backspacing in the front. 5" to 5.5 will work up there. If you did that you could run 245/45/17. Maybe the same 255/45/17's that you run in the rear if you could manage 5.5" backspacing.
autoxcuda
Do you know of anybody who makes wheels in the small bolt pattern with these types of offsets? I've redone the calculations & finally decided that if I offset the rear springs I can run a good sized tire but I need a lot of positive backspacing. What I need is about 1 1/8" positive offset to center the rear wheels in the wheelwells.
These are the wheels sizes I could use & their respective backspacings;
7 rim 5 1/8
8 rim 5 5/8
8 1/2 rim 5 7/8
9 rim 6 1/8
9 1/2" rim 6 3/8
10 rim 6 5/8
If anybody comes across anything like this I'd appreciate it if they'd let me know. So far, the best thing I've been able to come up with is steelies with a custom offset.