I have set of boyd coddingtons. They are 18by8.5s

 

The perfect tire would be a 265. But you can fit a 255-275.

 

i would say the 275 would be ideal....since the sidewalls are about even with the rim on a 9" rim...you should have just a bit of bulge with a .5" narrower rim.


basically...275/35/18

 

255-265 on a 8.5" wide wheel. A 9" wide wheel is the narrowest reccomended for a 275.

 

What tires were stock on your 99 Z28? Were they the base 235/55-16's (26.1") or the optional Z-rated (RPO QLC) 245/50-16 (25.7")? You should try and get close to the stock tire outside diameter. Looks like the 255/40-18 (26.1") would be the best match.

Most manufacturers do not recommend an 8.5" wide wheel for a 275/35-18 (25.6")

 

http://www.discounttiredirect.com/di...w=false&cs=255

How would these work. I'm not too worried about high mileage or ride comfort as much, but im going to need something that offers good performance, and something that can still get me around in the rain.

 

An "all season" tire is intended for use in moderate snow. Do you really need that in North Carolina? Generally, a tire that is designed as an "all season" is not going to offer the performance characteristics that most F-Body owners want.

You could see the relative performance ratings, in terms of dry traction, wet traction, braking, cornering, noise, etc by looking at the customer feedback for comparison with similar tires from other manufacturers. Go to Tire Rack, click on tires by size, put in the size you want, put in "all season" and see what tires they offer. At some point you will get the option to go to a chart comparing the feedback on that list of tires.

Then put in the same size, and click on one of the "summer performance" categories, comparing the results for those tires with the "all season" results. You should see a pattern emerge, showing what the relative strengths and weaknesses of the all-season tires are.

 

How much money will i really save by buying them online

 

Depends.... and don't forget the shipping cost. Its often possible to take the Tire Rack prices to show to your local dealer, and they will match the online cost + shipping, or get close. In either case, you still have to pay extra for mounting and balancing.