I was searching for 15 inch tires on the internet and found these. I had not heard about them either but, they had good reviews on Miata forums. They were inexpensive so, I decided to give it a try. I just had these installed and they seem to have decent grip and are not noisy. I have not done any high speed testing. Also, they have a 140 rating so they should last for a while.
Shah
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