[lnfletcher]

I believe the problem you may have is with the outside of the tire extending slightly out of the fender well.
I'm running 295 50 15s on 9 inch rims with a 4.5" back spacing. That means your setup would put the inside of your rim 3/4" more spacing from the inner fender and 3/4" towards the outer rim. My tires sit just slightly inside of the outer lip of the fender.

Hope this helps.