Power Meter - Cykelstrom Power Meter App

The power meter capabilities of Cykelstrom help the cyclist understand where power is going during their ride. Cykelstrom calculates and displays the components of power due to wind, grade and rolling resistance.

Power Meter App Accuracy For This Ride

The best accuracy for this ride is highlighted in bold.

Sensors	Crank Power Meter (Watts avg.)	Cykelstrom (Watts avg.)	Difference (Watts)	Margin of Error (Watts)
External Speed and Cadence	140.16	148.35	8.19	+/- 1.48
GPS Speed and External Cadence	140.16	145.05	4.89	+/- 1.41
External Speed Only	140.64	156.30	8.19	+/- 1.65
GPS Speed Only	140.64	152.86	12.22	+/- 1.56

Table created using Bland-Altman Analysis using a 4iiii Precision Pro dual sided crank power meter as the standard with 95% confidence level.

Discussion Of This Ride’s Results

I developed Cykelstrom for those who wanted to see their power data while riding, but did not have the resources to purchase an actual power meter. The accuracy of an app running on a smartphone is not better than an actual power meter, however we keep improving to get as close as possible. Every now and then a ride’s results just gets me excited to see that it is possible to be very close to an actual power meter’s performance. It is clear that for best performance, using the Cykelstrom in conjunction with an external cadence sensor provides the best results.

The cost of a cadence sensor is an order of one or two magnitudes cheaper than a power meter. Cykelstrom when set up and calibrated properly can give acceptable results and enhance the cyclist’s ride experience. To learn how to set up Cykelstrom please visit Setting Cykelstrom Up For The First Time. To learn how to add a cadence sensor or any Bluetooth sensor visit Adding Bluetooth Sensors to Cykelstrom.