SCCA® Solo classing — unofficial guide
What autocross class is a BMW Z4 M Coupe/Roadster?
CSStreetSSTStreet Touring
A stock 2006–2008 BMW Z4 M Coupe/Roadster runs in CS (Street) under the 2026 SCCA Solo Rules. Built to Street Touring allowances (within SST tire and wheel limits), it runs SST.
From the 2026 rulebook (Appendix A)
Street: 'Z4 M Coupe/Roadster (2006-08)' = CS. ST: 'Z4 M Coupe/Roadster (2006-2008)' = SST.
Unofficial guidance verified against the 2026 SCCA® Solo® Rules — always confirm against the current rulebook before competing. Classing data cites the exact Appendix A wording it relies on.