Originally Posted by
chaadster
Even experienced track racers don't hold in excess of 140rpm. Sure, they'll sprint up to 150rpm, but typically race around 120rpm, but for the OP to have a goal of "keeping the screen blank" by turning over 140rpm is excessive by any measure.
It was only for bursts of 30 seconds or so -- even if it's not a "realistic" cadence to hold for a long period of time, I'm puzzled why the machine wouldn't support it. I wonder if it was simply a low battery like @
Carbonfiberboy posited, or if the sensor wasn't reading correctly. I don't normally have a cadence measurement available, and noticed that I was pedalling around 90-100 during the "normal/easy" parts of the class. 140 felt spinny, but not that crazy.
I really should have tried it on another bike.