On my road bike, rolling along on the flats, I tend to be in the 80s. On sustained climbs I usually feel best around 75-80. On short punches, if I'm seated, I'll usually shoot for a higher cadence (95+).
On my singlespeed MTB, I use whatever it takes, because I'm always in the wrong gear.
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"Swedish fish. They're protein shaped." - livedarklions