- Rider weight is irrelevant and not part of any calibration or power data from the trainer.
- This is not acceptable if you aim to get “accurate” power data.
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Ideally, yes.
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The whole point of the spindown calibration is to account for the current tire pressure, trainer roller pressure, and the tire itself. These matter because a change in any or all of those values will lead to altered power data.
- No, you only need to do the “Factory” spindown on rare occasions.
- You can do the “Regular” spindown as your normal one each time you workout (after the warm up).
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Of course. However, the difficulty in doing so lies in how accurate you expect your data to be. If you want the most accurate, you need to calibrate each time you swap at a minimum.
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Typical manufacturer recommendations are that you should calibrate a wheel-on trainer (like the Snap) each time you do a workout, even if you have the same bike and tire installed. This eliminates the risk of slightly different tire pressure and roller pressure from session to session.
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If you don’t care about the data (which is true for people who use a different power meter on the bike for their power), then you can skip the calibration all together. But that is not true if you are relying on the trainer for power data.
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Garbage in, garbage out. These tools have a proper process to use them if you want to get the best info from them. Wheel-on in particular requires a bit more work for that goal, so it’s one reason people like the wheel-off option instead.