I have just gotten the Stac Zero Halcyon trainer. in this case your rear wheel is completely free in the air and your resistance is provided by magnets.
Stac recommend that you use your highest gear, which means that during todays low power (less than 140w average) session i was “travelling” on average 45kmh. This is clearly ridiculous.
I know speed/distance has less meaning on a turbo but i’d like to have a realistic idea of how far i’ve travelled come the end of the year!