Wheel and Tire Upgrade

[stewd]

Looking to replace older wheels and tires on my '63. Have been running 15 x 6" Magnum 500 rims with P20575R15 tires for many years. Looking to install newer Mag 500

rims either 15 x 6" with a P20575R15 tire or upgrading to a 15 x 7" with a P215? Any comments appreciated about going to a larger rim and tire combo? Thanks.

[grant mills]

I can only give my experience. Many years back (after discovering my speedo read 10% higher dues to small michelins) I replaced them with 225/70-15 (on Dayton wire wheels) to get the speedo back up to within 1% of an accurate reading. The front tires experienced rubbing from the inner fender well when I did fast sharp corners (is there any other way to take a corner?) I switched the front to 225/60 and the rubbing stopped (plus it added to the rake of the vehicle)  Since I replace the front coil springs, the front sits high enough that I could use 225/70 all round. But I had gone back to the original sized tire for the Avanti of 205/75 at my last tire replacement.