SCCA® Solo classing — unofficial guide
What autocross class is a BMW Z4 Coupe & Roadster (E85/E86, non-M)?
CSStreetCSTStreet Touring
A stock 2003–2008 BMW Z4 Coupe & Roadster (E85/E86, non-M) runs in CS (Street) under the 2026 SCCA Solo Rules. Built to Street Touring allowances (within CST tire and wheel limits), it runs CST.
From the 2026 rulebook (Appendix A)
Street: 'Z4 Coupe & Roadster (non-M) (2003-08)' = CS. ST: 'Z4 (non-turbo, non-M)' = CST.
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.