I'm thinking about getting a set of diamond wheels for my 83 RX7 IT car. What sort of backspacing do i need. I was planning on getting 13x7's, is that too big? If not what size tire can i run, without substantial rub? On a second note, has anyone tried the new Kumho Ecsta v700's? They come in some sizes that look pretty good (on paper) for the RX7, like 215/45's might be a 50 series. I'm looking for a compromise between outstanding grip and longevity. Most bang for the buck. The Grasroots test (old one) made it look like the Kumho's were almost as fast as hoosier's. Whats the consensus of the group?

Thanks in advance,
Chris
IT7 #88
PowerTrip Racing