Description
FSA CK-320 Bosch Gen4/Yamaha ISIS E-Bike Crank Arms
Category: Bike Parts
Subcategory: Cranks
Elevate your e-bike´s performance and reliability with the FSA CK-320 Crank Arms, a robust and purpose-built solution for the most popular electric bike motor systems. Engineered specifically for the high-torque demands of modern e-bikes, this crankset delivers a secure, efficient connection between you and your motor, ensuring that every ounce of effort is translated into powerful forward momentum. Whether you are upgrading your stock components or building a custom e-bike from the ground up, the CK-320 provides the strength and durability needed to conquer challenging trails and demanding commutes with confidence.
The core of the CK-320´s strength lies in its solid construction. Crafted from high-quality diecast aluminum, these crank arms are designed to resist flexing under the significant load produced by both rider input and motor assistance. This exceptional stiffness results in a highly responsive and predictable pedaling platform, giving you direct control and improved power transfer. The arms are built to endure the rigors of all-terrain riding, from technical singletrack to rugged fire roads, making them an ideal choice for e-MTB enthusiasts.
Featuring the industry-proven ISIS drive spline interface, the FSA CK-320 ensures a secure and precise fit onto the motor´s spindle. This standardized design is renowned for its reliability and ability to handle high torque without developing play or creaking over time, a common issue with lesser interfaces. This ensures a quiet, efficient, and maintenance-free connection that you can depend on ride after ride.
Aesthetically, the crank arms boast a sleek and understated design that complements any e-bike build. The durable, painted bead-blasted black finish not only looks professional but also provides an extra layer of protection against scuffs, scratches, and the elements. This resilient coating keeps your cranks looking fresh even after seasons of hard use. To complete the look, crisp and clean printed FSA graphics add a touch of professional race-ready style.
Attributes: Cranks, E-bikes, Without sensors
FSA Armset compatible with YAMAHA PWX, BOSCH GEN4 engine
Features:
* Diecast AL crank arms
* ISIS drive
* Painted bead blasted black, printed graphics
Specifications:
* Type: Crankarm
* Discipline: E-BIKE
* Material: Alloy
* Engine: BOSCH, YAMAHA






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