Keep in mind that Resistance mode is based on a percentage that relates to the max resistance (power) available from the trainer.
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If you have a trainer with a 2000w max, 50% Resistance setting is going to give around 1000w resistance. This is dependent on your selected gearing and cadence, so it’s not an absolute value.
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Usually, a good range of Resistance is 20-40% for many riders, trainers and gearing options. But be willing to adjust the percentage to allow the proper use of your gearing (high and low) to hit your power targets.