Originally Posted by Mike

I track with 15s in the rear now and used to use 25s in the rear with no problems. On the street, I run 15/15. I choose to use spacers so I can use the same wheels front and back for track use and rotate my tires.

The only issue I have had is a balance problem with ichiba spacers, because their hubcentric ring isn't deep enough to fit into my Nismo rims, so it doesn't center them. Switched to H&R and have no problems at all.