Just ask the vdub guys - they would but a 225/35 on a 10.5 inch rim - talk about no curb protection!

I would go with the 295/40's on 10's - close to the width and diameter of the 315's and approved for the wheel - you can certainly make the 315's on the wheel, but it will tend to wear the center of the tire a little early and certainly will void any tire warranty (not that tire warranties are worth much!).



295/40R20 106V 244330 10.0-10.5-11.5 29.3 11.7 11 39.2
295/45R20 114V XL 244300 9.5-10.0-11.0 30.4 11.6 11 40.3
305/50R20 120V XL 244260 8.5-9.5-11.0 32 12.1 11 47
315/35R20 106W 244340 10.5-11.0-12.5 28.6 12.3 11 36.4
315/35R20 110W XL 244540 10.5-11.0-12.5 28.6 12.2 11 36.7