Power targets, how close is close enough?

This has probably been covered before, but how close is close enough when aiming for power targets during repeats? I typically am within +/- 4-5 watts, or 3-4% on the work intervals. I feel this is close enough to achieve the desired purpose of the workout, but maybe I’m fooling myself. Thoughts?

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Power meters are only accurate in the 1-3% range. Your FTP is probably only accurate in the 5% range. With all the errors cascading on top of each other sweating 5-10W is just a part of being a neurotic cyclist. Try and get close, understand how the different zones should feel, and put in the kJs. You’ll get faster.

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Absolutely good enough, you’re splitting hairs and operating well within the acceptable margins of your power meter.

Good job. I try to keep within 5 watts as well. Keeps my brain from freakin out.