S Spider for Bosch

Ochain S is engineered to deliver greater control and confidence for e-MTB riders across everything from downhill tracks to demanding trail rides. Its next-generation spider mechanism allows the chainring to rotate backward, decoupling the rider from pedal feedback forces. This reduces drivetrain noise and chain turbulence, resulting in a quieter bike and a more composed ride over rough terrain.

By minimising pedal kickback, Ochain S improves stability while braking and cornering, helping riders maintain control in technical sections. The external travel adjustment system allows precise tuning of chainring rotation, enabling riders to select the level of travel that best suits their riding style, terrain and bike setup. Mounted at the motor, the system delivers consistent and natural performance regardless of cassette gear changes. The latest generation also features improved impact resistance and enhanced sealing for greater durability and protection against contamination.

Features
• Spider system that decouples pedal feedback from the drivetrain
• Designed specifically for e-MTB applications
• External travel adjustment with selectable travel settings
• Improves braking and cornering stability on rough terrain
• Reduces drivetrain noise and chain turbulence
• Compatible with Bosch BDU38 (CX Gen 5) motor systems
• 104 BCD chainring compatibility
• Re-engineered construction for improved durability and contamination resistance

Specifications
Compatibility: Bosch BDU38 (CX Gen 5)
Chainring compatibility: 104 BCD
Travel settings: Lock, 3°, 6°, 9°, 12°
Included components: Ochain S spider
Service interval: 100 hours elastomer replacement, 200 hours full service