TRIPEAK Jetstream Pro 12-18T Hollow Alloy Cage is designed for Shimano R8100 / 7100
Its features include:

Hollow aluminum alloy shell:

Made of lightweight aluminum alloy material and designed with a hollow structure to reduce weight, increase stiffness and durability.

12-18T gear ratio:

Provides smoother shifting and higher efficiency, suitable for various riding conditions and requirements. High-quality manufacturing process: Uses advanced processing technology and high-precision CNC machines to ensure product quality and reliability.

Compatible with multiple models:

Suitable for various models of rear derailleurs, such as Shimano R9200, R8100, Ultegra 105 R7100, allowing for easy upgrading of your bike's rear derailleur system.

The TRIPEAK Jetstream Pro 12-18T Hollow Alloy Cage is a high-performance, high-quality rear derailleur gear set that can enhance your riding comfort and efficiency, making it an ideal choice for cycling enthusiasts.