S&S Cycle 31-2107 Flywheel Assembly for Big Twin Engines

The S&S Cycle 31-2107 is a precision-engineered flywheel assembly designed for S&S and Harley-Davidson Big Twin V-twin engine builds. S&S Cycle flywheels are manufactured to exacting tolerances, ensuring proper balance, durability, and reliable power transfer in high-performance and custom engine applications.

Key Features:

• Precision-machined flywheel assembly from S&S Cycle, a leader in American V-twin performance
• Designed for Big Twin engine configurations
• Built to tight balance and runout tolerances for smooth engine operation
• Compatible with S&S engine cases and select OEM Harley-Davidson applications
• High-strength construction suitable for street and performance use

S&S Cycle has been producing industry-leading V-twin components since 1958. The 31-2107 flywheel assembly reflects that heritage, offering builders and mechanics a dependable foundation for custom or replacement engine assemblies.