The Tacx Campagnolo Freehub Body is specifically designed for use with the Tacx Neo 2 and Flux trainers, featuring a 12mm internal dimension axle hole. This freehub body allows for seamless compatibility with Campagnolo cassette systems, ensuring smooth and efficient power transfer during your indoor cycling sessions. Its durable construction guarantees longevity, making it an essential component for serious cyclists looking to enhance their training experience. Easy to install and replace, this freehub body is a reliable choice for maintaining optimal performance on your Tacx trainer.