What spacers do I need?
 

I have a spare set of 16x7 Kosei K1's, 42mm offset wrapped in 205/55 RA1'a for the track that I want to run on my S2K for a lapping day. Suspension is at stock ride height at the moment, so i'm wondering what size spacers could I use that would work with these wheels on the rear to ensure they clear the brakes and don't rub?

Any help or advice would be greatly appreciated.

Thanks,
Steve

You will not need spacers. In fact the wheel already has a lower offset than what is needed. With the 205/55R16 the tire is narrow enough to probably work.
I would just not recommend to run the same size all the way around on the S2K.

Thanks for the heads up Jim. Yeah, i'm kind of reluctant on running 205's all the way around, these wheels and tires are my buddies track setup for his RSX-S and suggested I toss em on for a few laps next weekend. I guess I'll test fit them this week without the spacers and see how the car feels, if it's unsettled feeling I won't run them.

Thanks again,
Cheers; Steve