Just write you a PM
@Roberto_Viola Hi Robert, thinking of buying the Cog but i have an Tacx Flux 2. Is it possible go get it working? Can you send me a pm? 
Sent! Let’s continue there!
Hi! Can i alsi get the information?
Roberto, I just bought a Tacx Flux 2 and the Zwift Cog will not fit. I called zwift and they sent me a return label saying not compatible. I really wanted the cog to work with my trainer because I don’t want to bother with derailleurs. Are you able to advise how to make the Cog fit on my trainer?
The Cog will fit on your trainer. If you bought the Cog mounted on the multi-trainer freehub, you need to remove it from that freehub and install it on the one that’s already on the trainer. If you bought the Cog without a freehub, it comes mounted on a plastic sleeve that needs to be discarded.
Paul,
I purchased the Zwift Click + Zwift Cog 1.1 w/ Multi-Trainer FreeHub Upgrade Pack. Based on what you are saying I can remove the freehub and install with the shimano freehub? Correct.
Yes the multi-trainer freehub is a Shimano compatible freehub. The cog is a Shimano compatible cassette that will fit on any freehub compatible with 11 speed Shimano Hyperglide.
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