NOTE: The adapter kit is only compatible with Tacx smart trainers with a 12-millimeter inner diameter of the trainer axle (type 2). Tacx Neo 2, Flux 2 and Flux S trainers were delivered with both type 1 and type 2 axles. Type 1 trainers (produced until October 2019) have an axle inner diameter of 6 or 9 millimeters.
The Tacx freehub body enables the attachment of 11- and 12-speed road bike cassettes and 11-speed road bike cassettes to Neo 3M, Neo 2T and Flux Smart trainers. You can also fit 10-speed cassettes using the spacer ring included in the scope of delivery.