I've got a '68 RS/SS Convert with redline tires on it that I would like to replace. The ones that are on it are Michelins that look like they had the redline added to the inside of, and the redlines don't look very good. Plus they're aging out and I'd like some fresh rubber. My first question is what brand of tire have you found with the best redlines? I've looked at Coker and Diamond Back, and they both look nice. I'm curious what others have found, and which models end up working nicely on a 1st gen Camaro.

Secondly, the existing tires on the car are size P215/70R15, mounted on rallye rims (I don't know whether they are stock spec for offset/backspace, but I would imagine they are) and I get a very quick but harsh-sounding and annoying rub when I hit a bump at speed, on the front left corner. It is very brief and hasn't done any damage to the tire, but it's loud and alarming, and I'd just as soon not have a rub. Right now, the tires really fill out the wheel well nicely, and I think the size looks great. I'm thinking of dropping down to P205/70R15 and hoping that this does the trick with the rub and still looks good. Does anyone have experience with these two sizes and know whether my issue will be solved? The 205 size should be about 0.55" shorter in hight/diameter, and I'm thinking that may avoid the rub and still look good.

I don't know if the various models that Coker and Diamond Back have significantly different sectional profiles to the tires, but I would suspect that a squarish profile would be worse in my case, as it seems that the rub comes from the outside edge of the tread area. The existing tires have a pretty modern (squarish) section, in my estimation, with a pretty wide contact patch. Looking at the literature, it looks like Diamond Back III or Diamond Back SS may have a little more rounded section than the Diamond Back Touring, for example.

Any thoughts and advice are welcome!

Thank you.