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do you tend to get a stupidly high average speed on rollers, or do I need to look at how my gsc10 speed sensor is calibrated.
Unless you have a 75 tooth chainring and are running 11 and 12 tooth sprockets the numbers don't make sense. With a cadence of 88 RPM you will need that kind of gearing to be able to average 67 kmh with 700c wheels. It looks like it screwed up between miles and km. If you did 5.4km it could almost make sense: ~40 kmh
EdwardZ
do you tend to get a stupidly high average speed on rollers, or do I need to look at how my gsc10 speed sensor is calibrated. https://www.strava.com/activities/286703497