Complete Guide to Spec Miata Racing Classes and Organizations: What Do All Those Letters Mean?
Road racing Miatas come in various classes, with Spec Miata (SM) being the largest and most popular in America. Here's a comprehensive guide to the different classes and where to race them:
Main Spec Miata Classes:
- SM: Standard Spec Miata, raced in both SCCA and NASA
- SM2: NA (1990-1997) Miatas only
- SMSE: Southeast regional class for 1990-1993 1.6L only
- SMT: SCCA Spec Miata running Toyo tires instead of Hoosiers
- SSM: Showroom Spec Miata (1990-1993 1.6L only, more restrictive rules)
Other Related Classes:
- ST6/TT6: NASA power-to-weight classes
- STL/ITS: SCCA classes where Spec Miatas often compete
- Various regional and club-specific classes
Mazda Miatas lined up at race
Major Racing Organizations:
SCCA Requirements:
- Hoosier tires (SM 7.5 or Wet)
- Optional containment seat/center net
- Optional fire system
- Specific final drive and camber requirements
NASA Requirements:
- Toyo tires (RR, RA1 for wet)
- Mandatory containment seat/center net
- Mandatory fire system
- More flexible drive and suspension options
Racing cars at NASA Northeast event
Additional Racing Opportunities:
- SVRA Vintage Racing
- Gridlife events
- Endurance racing (Lemons/Chump/AER)
- Private track clubs (Lime Rock, Monticello)
Red Spec Miata racing on track
When buying a race car, verify its specific class modifications, as converting between classes can be expensive. Class rules change frequently, so always check current regulations before competing.
Spec Miata race car on track
Blue Miata race car
Modified Miata engine compartment
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