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The resistance is a combo of fixed magnets and electronic braking so the faster the wheel is going the greater contribution from the fixed magnets. If you use the TR recommendation at about 250 W and a low 20km/h wheel speed the braking can't contribute enough and it just gives up. You can actually overload the electronic braking after 20 mins of it running max resistance and it will just shut down. That was fun.
In the big ring and wheel speed at >30km/h its works perfect even going from 100-400w in the same gear
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