The Shimano Nexus 3-speed center gear SG-3S40 is ideal for upgrading or replacing your bike's transmission system. It ensures smooth and reliable operation with three speeds, providing the flexibility you need for your daily rides.

• Supports speeds: 3
• Compatible with the Nexus system
• Available with 20 teeth

Its construction offers durability and long-term use, making it perfect for urban riding and invigorating cycling. Don't hesitate to trust Shimano's quality for your bike's needs.