Helix Core Alloy Crank 165mm Bosch e*thirteen

e*thirteen Helix Core Alloy Crankset – 165 mm, 73 mm spindle (CS4HBA-104) – Forged AL-6066-T6 arms, lightweight at ~589 g, Boost/SuperBoost-ready chainline, 24 mm chromoly spindle, self-extractor bolts, cross-compatibility with SRAM® & Shimano®, adjustable chainline (52/55 mm).

• 165 mm length – optimal for balanced pedaling leverage and clearance

• FORGED AL-6066-T6 arms with CNC weight savings

• 24 mm chromoly spindle for strength and shelf compatibility

• Boost/SuperBoost chainlines (52/55 mm) for tire clearance flexibility

• SRAM & Shimano compatible, with self-extracting bolts for easy service

Experience rugged reliability and refined performance with the e*thirteen Helix Core Alloy Crankset (165mm, 73 mm spindle, CS4HBA-104). Built for trail and enduro riders, this crank delivers strength, lightness, and versatility in one dependable package.

• Material & Build: Forged AL-6066-T6 crank arms with integrated weight-reduction features and precision CNC machining keep the weight down while maintaining enduro-level toughness.

• Spindle: A heat-treated 24 mm chromoly spindle paired with a 68/73 mm frame width ensures excellent bearing compatibility and durability.

• Chainline Options: Achieve Boost (52 mm) or Super Boost (55 mm) chainlines with included spacers—enhancing rear tire clearance and drivetrain fit across a range of bikes. 

• Compatibility: Works flawlessly with both SRAM® and Shimano® 11/12-speed drivetrains, delivering consistent performance with high-end flip-flop Helix Race or Helix Chainrings (28–34T), sold separately

• Ease of Maintenance: Featuring a self-extractor bolt system and a creak-free Quick Connect interface, installation and removal are clean and worry-free—providing premium functionality without the premium price tag.

• 165 mm length – optimal for balanced pedaling leverage and clearance

• FORGED AL-6066-T6 arms with CNC weight savings

• 24 mm chromoly spindle for strength and shelf compatibility

• Boost/SuperBoost chainlines (52/55 mm) for tire clearance flexibility

• SRAM & Shimano compatible, with self-extracting bolts for easy service