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@barber
its usually ok because you are only at that cadence for a short amount of time, and i think you will find that riding down the hill fixed, you won't reach the same speed as on a freewheel bike unless you put some effort in, because the drivetrain will have more resistance in it - some of the energy is wasted spinning the cranks, and moving your legs, unless you are perfectly keeping your legs going round at the right speed,
i think 180-200rpm can be done relatively comfortably over short bursts