Solo Rules
Solo rules is your home to view the current Solo Rulebook, Supplemental class rules, ProSolo rules, FasTrack, and Rules proposals. The content on this page will provide valuable information for Solo compliance in the SCCA.
To request a new car classification, adjustment or clarification on a rule, click on the link below to submit a letter:
Send a Request to the Solo Events Board
Rule Making Process
Rule Making Process Flow Chart
Fastrack
Current and Archived Fastracks
Current Active Change Proposals
Quick Reference Guides
Unofficial Solo Car Classifier
Helmet Certification Allowances with Label Chart - Updated 02/15/2024 (No Changes for 2025)
Category Allowance "Cheat" Sheet
Solo Spec Coupe (SSC) Official Specifications
Training
Solo Safety Steward Webinar Training
For more training materials, log in to your SCCA Member Account Portal, head to the File Cabinet and scroll down to Solo and Solo Safety
Event Waiver Procedures
Waiver Procedures
Waiver Checklist (47 states, excludes California, Florida, and New York)
Waiver Checklist for California
Waiver Checklist for Florida
Waiver Checklist for New York
2024 Sound Guidelines & Event Reports
2025 Solo Rules
The 2025 Solo® Rules online are made available by SCCA Solo as a courtesy to our entrants, volunteers, and anyone interested in learning more about technical regulations governing SCCA Solo. If you would like a copy of the printed National Solo Rules, they are available for purchase on Amazon: 2025 Solo Rules - Print Edition
The 2025 Solo Rules online version is available in Adobe Acrobat format, version 10 or later. Download the latest version of Adobe Acrobat Reader here. iPad and iPhone users should save this file in the acrobat reader app, not in ibooks (ibooks crashes when trying to use the search feature).
- 2025 Solo Rules download (Updated 3/12/2025)
- 2025 ProSolo Class and PSI Updates Summary (3/28/2025)
- 2025 ProSolo Rules download (Updated 6/16/25)
- 2024 Sound Guidelines & Event Reports
Supplemental Classes
Supplemental classes are provided to help give regions other class options for members at their events. Some of these supplemental classes are run at National Solo events and even the Tire Rack SCCA Solo Nationals. Those classes that compete at Solo Nationals are not eligible to win a championship.
Allowed at all National Solo events including Solo Nationals
- 2025 Classic American Muscle (CAM) / Xtreme Street (X) - Updated 3/26/2025
- Formula SAE
- Electric Vehicle Experimental (EVX)
- Club Spec
