this is a very slow forum area so I will post this elsewhere also.
FYI you will not be able to buy the new SM spec tire
from Tirerack.
Quote:
Hoosier was recently named as the 2012 SCCA spec tire provider for the popular
Spec Miata racing class. The spec dry weather tire, designated “SM6”, will only
be available from trackside servicing dealers. It is not available to Tire
Rack. Interested competitors should contact Hoosier to find a local trackside
service dealer in their area.