I was just going to post this when I saw the above post so had to comment there first.
My latest setup for the street.
225/24/15 BFG Rival S on Konig Helix roll formed 15x9 which is the optimum width as tested by the guys at Grassrootsmotorsports and Andy Hollis a many many times championship driver.
They still work quite well on an 8" wide rim which I would of been OK using for the street but none fit over my BBKs with the right offset.