Originally Posted by
PeteHski
That's 25 mph (40 kph) right there! Are you recording cadence? That is not sustainable for pretty much anyone for very long.
I don't measure cadence and you're right, that's too high for me to sustain for long so it's definitely a bad estimate. I can get to that speed in the flat with a lot of effort, and regularly can keep in the 20-24 mph range in the flat on that gear combo.