FSA

Bosch BDU31 ISIS Armset

FSA Bosch BDU31 ISIS Armset delivers dependable performance and precise power transfer for Bosch-equipped eBikes. Designed with ISIS interface compatibility, these crankarms provide a secure, durable connection that stands up to the added torque and demands of electric-assist riding.

Built by FSA, a trusted leader in drivetrain components, this armset is engineered for riders who expect smooth pedaling efficiency and long-lasting reliability. Whether replacing worn arms or upgrading your setup, the BDU31 ensures a perfect fit and consistent performance with Bosch BDU31 motor systems.

• Compatible with Bosch BDU31 motor systems
• Durable alloy construction for strength and longevity
• ISIS spindle interface for a secure, precise fit
• Ideal for eBike maintenance or replacement needs
• Designed for reliable power transfer under high torque loads