I have a reply to it. It's been shown that riding isopower (ie; keeping the power constant) is the way to go fastest overall. It doesn't matter if it's a flat course with a headwind or not, hilly or mountainous - isopower enables you to go the fastest you can go. Mind you - it's easier said than done - I couldn't believe how slow you have to go uphill and how much power you need to apply downhill to achieve it.
Measuring power is fantastic for training - you can measure your workouts & improvements (as well as avoid over-training) and also for racing in terms of metering your effort. If you are bunch racing it's not much use during the race as you can't really look at it - or do anything about it. But it's very useful afterwards to analyze what you did.



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