- Assuming you picked a cassette similar to your actual bike, there’s no need to change it.
Did you perform a calibration on the trainer?
- This should be done at least once a month for the H3, and done after about 10 minutes of riding to make sure the entire system is at operational temps.
You don’t mention a power meter, so if you are relying on the trainer for power reporting, you should do a new Ramp or FTP test on the trainer.
- Your FTP from any other source is not likely to match on this trainer.