The Shimano SIS OT-SP41 is a widely used, high-performance outer housing for bicycle derailleur systems. It is specifically designed to reduce internal friction and features a pre-lubricated interior with a special silicone grease for smooth, quick, and precise shifting
Key Specifications & Features
- Diameter: 4mm (standard for shift cables)
- Design: Utilizes long strands of steel wire in an axial arrangement for direct power transmission rather than a coiled metal core.
- Performance: Pre-lubricated along its entire length to decrease resistance and provide intuitive, light-action shifting.
- Maintenance: Best paired with sealed end caps to prevent dirt, mud, and water contamination, which maintains the slick feel over time


