I just leave my regular real wheel on my bike (stock wheelset) but my friends who have upgraded wheelsets will swap their rear wheel back to the stock wheel or another designated "trainer wheel" for riding inside. They usually swap back to their other wheel if they're able to ride the road bikes outside in the winter at all but that's their choice.
I do put an old tire on my bike for riding inside and then just leave it on for the entire winter.



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