I can't even begin to say how impressed I am with S21's
I thought I'd give them a try because they get pretty good reviews and
the cost is great. $215 to the door, on sale $165 with rebate (over now)
Using them track only on my Gen2.
I've used Mich power ones, Mich Super Sports, Pirelli Super Corsa SP's, Q3's and more.
I've got 2 track days on them now and they are holding up great. Third track day in a couple of weeks. I usually get 3-4 track days from a set of tires and these will make 4 easy.
My 2nd track day I tried everything I could to get these tires to act up, but I never did get them to step out and tried like heck to get them to spin up, but no go. I have no problems spinning up Q3's. I pushed these way harder then Q3's and could not spin them up. Decided I really didnt want to push them any harder.
I'm running high B group pace.
Those pressures seem a little to high to me. I got the pressures right where I needed them to be. I go for a 6psi rise from cold to hot.
I found 31psi front and 31psi rear cold perfect. 220lb suited, 95f degrees temps
I like them so much I'm probably going to give them a try on my zx14 too.