I have the swift-R's, and I really like them. I also autocross, and track my Nismo, and noticed a little imporvement in time with them, I have to be careful of drive ways, and have only scaped on just a couple speed bumps.tH
As for tires, and such, I'm on 305/30 and 275/35's which feels so much better then the 305 and 265's. For my driving style the 305's were a little to pushy for the 265 wide tire. Oh yeah, and I'm running all stock arms etc with no issues.
I belive the ratios are;
Rear
285/35's is 26.9 (stock)
305/30 is 26.2
315/30 is 26.4
Front
245/40 is 26.7 (stock)
265/35 is 26.3
275/35 is 26.6
Hope this was a little helpful.
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