This year will be my first year road racing my '85 GTi. Currently I've got a couple sets of 14x6 wheels that I might mount up some race rubber on.

My questions are:

1) What tire size is best for a stock GTi in a 14" diameter?
2) If I go up to a 15" wheel, what's the best tire size?
3) Should I go up to a 15" wheel? What are the benefits?


Sorry for the noob questions.