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@gbj_tester
I would use 75" if I didn't think I was going to get under 27:00, but you have to find your own gear by experiment. From talking to other FG testers, average cadence can end up anywhere from 65 to 105rpm for people who have optimised for minimised elapsed time. I'm right in the middle with 80rpm feeling hugely over geared and 90rpm feeling too spinny.