ps31 is bad? my friend use it to race at sepang, the grip is amazing on his iriz, never lose traction once for the whole track day..

another friend driving vios is changing from v12 to ps31, which then he said it's actually a bit better than v12..

so the question is, is PS31 is bad?

planning to upgrade my rim/tyre on iriz 1.3MT from 185/60R14 to perhaps 195/55R15.