I am strongly considering buying a set, as my OE rings are reaching their minimum thickness. Problem is, I do more autocrossing than track days, so I won't have any good answers about their durability for quite a while. I did email ZZP and they said:
Quote:
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Originally Posted by ZZ Performance
Yes they are exactly the same as the factory original rings. Same 100% internal design as well. Should weigh exactly the same. If not 100% exct weight it would be very close.
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I was asking about the weight because I would want to make sure they fit within F Street rules in SCCA autocross class rules (Girodisc and DBA could be protested). Anyway, the only real question is metallurgy and treatment.