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Which in the case of @Cycliste appears to be the same as her 10 mile pace. Her fastest Strava segment (gravel pits roundabout to Snett and back) in a 100 mile race on the B100/4 is faster than her time for the same segment in a 10 mile race on the B10/3.
I think it's a bit like the old resistor-based speed controllers on Tamiya model cars. You've got three speeds - off, la-la-la, race.
Sweet spot would be your 50 mile TT pace, HTHY