Bike Forums - View Single Post - Rally XC100 pedals vs. PowerTap

06-14-22, 07:18 AM

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OshkoshBiker

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Quote:

Originally Posted by hayden52

I recently acquired a set of Rally XC100 power pedals and was curious how the power measurement compared with my PowerTap hub, so I did a ride with my wife's Garmin paired to the PowerTap and my Wahoo! Elmnt paired to the pedals and uploaded both rides to Strava to compare. I also made a spreadsheet and graphed the results. What I noticed is that the pedals seem to smooth the data more than the hub, and (surprisingly) the hub measured about 4% higher. Maybe because the pedals only measure my left leg and double it, and there may be an imbalance. Here're the data:

Here are the links to the Strava rides:

Strava PowerTap
Strava Rally XC100

Cheers,
Gabe Cardona

If you like to delve into the topic further, do a Bland-Altman Analysis. You already have the spread sheet and it is easy to do. Look at the scatter plot and see if there is a bias. You can also plot a histogram of each power meter one over the other and see how the shape of the distributions differ.

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