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I believe it is not possible but will ask anyway: we have 2 bikes at home, both disk Ultegra Di2, one is 11 speed and the other the new 12 speed.
Any chance of having 1 trainer that would work for both bikes easily? Thanks!

Hi

The only difference is the hub (no adapters involved).
So, a thing you can do to make your life easier is to prepare the cassette already mounted on the respective hub so you can change it quickly

Regards