joemamma

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Steve S.

Hey Joe...<p>If you are shooting for "R" compound tires...you cannot find any on Tirerack's website in that size. For ultra high performance tires you can only find BFG g-force KD tires, Pirelli PZeros, and one Michelin MMX (?). A lot more options on a 17" tire, even more on a 16" tire. I now autocross on Kumho V700 VictorRacers in 225/50/16 size...only $130/tire at Tirerack (with a treadwear rating of 50)<p>Say hi to Tina and Roland for me when you see them. <p>Steve S.<br>97 2.8QM

Albert

What's better? 225/45/17 or 225/40/18 for the track?

ErikR

You can run a 235/245x16 with the legal 5mm spacer in stock. Why would you run a narrower tire with no sidewall? Since you have apparently changed rims: SP or ST you would want to still stay in the 17x8/8.5 range which is still a 235/245 wide tire.<p>The taller sidewall gives you a bit more lattitude for setting up the car. It will give a bit more warning before the tire breaks away, and a bit more traction on rough courses. And, it is a lot cheaper!<p>The rule of thumb for racing is to run the widest rim with the widest tire that lets the car turn in. That combo would be a 235/16. If you can get the aspect ratio down then you get a better gearing advantage for acceleration, and better handling. This shorter overall tire then gives you the best of all worlds. The Corvette and P car guys are running 17's at natl. instead of the factory 18's for these same reasons.