517971 Sprocket shaft, 1955 Big Twin

This splined sprocket shaft is a very specific component designed exclusively for 1955 Big Twin models. It is an OEM-style replacement for part number 24001-55. The 1955 model year was a transitional period for Harley-Davidson crankcases, making this splined shaft a unique requirement for those particular engines. It is manufactured to precise tolerances to ensure proper alignment and strength within the flywheel assembly. If you are restoring a 1955 Panhead, using this year-specific shaft is essential for a correct and functional rebuild. It provides the factory-correct splined interface for your primary drive components, ensuring your classic Big Twin stays period-accurate and mechanically sound.