From another forum and I am definitely interested so I thought I'd pass the info along:
I know this doesn't apply to everyone, but I am looking for any help we can get. Some enthusiasts(Miata definitely applies) that are making big power or are tracking/auto-xing their street cars would like to see a wider tire option that what is currently out there, that can perform when needed, and still run from home to the track. Right now, 245 is the widest street tire available in a 15" size.
This week, I have reached out to several manufacturers and got a positive response from one(Maxxis) speaking of possible development of a wider street tire, and that if I wanted to put together a petition to show interest in may expedite getting something going.
Please consider signing the online petition linked below to help show interest in a tire this size. Also, please don't be afraid to share with your local groups/communities to help!