Is it possible to fit a 315 on a ten inch wide rear rim? Thinking about trying it, what do you all think?

 

no, no, and no

 

I would suggest NO

 

What's the widest your thinking.....I'm running a 285 right now with plenty of room to go wider

 

295 would be the max. You might have room for more, but the wheel doesn't. If you had a 10.5, then i'd say go 305. But on a 10" wide wheel, the most i'd go would be a 295.
-GP-

 

do you have a mustang?

 

no G35 coupe

 

285 on a 10 " wheel=perfect
anything over 285 is going to make you feel loose in the rear you will be riding on the center of the tire cause it is too wide for 10" wheel
Ive done 295 on a 10" and a 305 on a 10.5" and both were sloppy in the rear