The 2025 SCCA Solo Rules have arrived with a new set of classifications: the Street Touring Category. In general, the Street Touring Category moves the legacy "ST" classes (STH, STR, etc.) to newly formed classes that more closely match the naming conventions of the Street and Street Prepared classes. Not all cars formerly in one class move to a single new class however; some are split among two or more new classes: for example, most of STR moved to CST, but the ND Miata moved from STR to AST.

The full Street Touring rules can be found in Section 14 of the 2025 SCCA Solo Rules, with specific vehicle classifications in Appendix A.

If your previous class name started with "ST" then it's time to check Appendix A, read thru the rules in Section 14, and if you're still as confused as I am, email our Solo Chair for clarification!

In general: