Tag: bicycle computer app

Bicycle power meter apps, like Cykelstrom, utilize real-time weather data for accurate calculations. Factors such as wind resistance greatly affect a cyclist’s power estimate. Air density is crucial in determining power needed to overcome wind resistance. Cykelstrom uses current air density providing better power estimates than generic values alone.

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Gravel Bike, Smartphone And Sensors

I rode a Diamondback Haanjo Comp as a gravel bike for this ride equipped with a 4iiii Precision Pro dual sided power meter on a Shimano 105 11-speed group set. The speed sensor was a Wahoo Bluetooth speed sensor and cadence information was provide by the power meter. Heart rate information was collected with a Polar H7 chest strap sensor. The smartphone was a Samsung A21 running Android 12 and Cykelstrom version 1.50. All of the power meter and sensor data was collected, saved locally and automatically uploaded to Strava with the Cykelstrom Bicycle Power Meter App at the end of the ride.

Gravel Bike Power Meter App Accuracy

The best accuracy for this ride is emphasized in bold.

Sensors	Crank Power Meter (Watts avg.)	Cykelstrom (Watts avg.)	Difference (Watts)	Margin of Error (Watts)
External Speed and Cadence	90.71	103.40	+12.68	+- .9812
GPS Speed and External Cadence	92.63	95.08	+4.37	+- .9647
External Speed Only	90.71	109.33	+16.70	+- 1.068
GPS Speed Only (no additional sensors)	92.63	100.18	+7.55	+- 1.0625

Discussion Of This Ride’s Results

I have emphasized in bold the results from “GPS Speed and External Cadence” as the most accurate. When compared to the dual sided power meter, Cykelstrom had a small bias of 4.369 +/- .9647 Watts which is an average difference of about 5% for the best case scenario. The worst case scenario shows a bias of 16.70 +/- 1.068 Watts, which is an average difference of about 18%. This is typical performance when riding on a gravel surface, where more noise and obstructions are present. When calibrated correctly, Cykelstrom provides acceptable power measurements for the the recreational gravel cyclist.

To see answers to commonly asked questions about Cykelstrom visit our FAQs

Strava Activity

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The Cykelstrom Road Bike Power Meter App Is Exclusively Available On Google Play

Stacey and I go on a short ride west of Oshkosh, Wisconsin on this very hot morning. This video shows the Cykelstrom Bicycle Power Meter App and detailed information of where the cyclist’s power goes. Calculated power estimates are shown for wind, up/down hill and rolling resistance power components.

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	89.56	106.30	16.74	+/- 1.74
GPS Speed and External Cadence	89.56	103.75	14.19	+/- 1.69
External Speed Only	89.39	129.35	39.96	+/- 2.30
GPS Speed Only	89.39	126.08	36.70	+/- 2.24

Discussion Of Bicycle Power Meter App Ride’s Results

The best accuracy, in bold, is when GPS Speed and an external cadence sensor was used. I would also like to point out that when only and external speed sensor or GPS speed was used in this ride, the accuracy was not as good due to a lot of coasting. The addition of the cadence sensor really helps out in this situation. You can observe on other rides where there is not a lot of coasting the that the GPS speed or speed sensor only results are better. For best accuracy, I recommend using an external cadence sensor. Cadence sensors are very inexpensive relative to purchasing a crank power meter. If you would like to learn how to add a cadence sensor please visit Adding Bluetooth Sensors to Cykelstrom.

Strava Activity

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The Cykelstrom Bicycle Power Meter App Is Only Available on Google Play

This is my regular bicycle ride to test and validate the Cykelstrom Bicycle Power Meter App. Cykelstrom is a bicycle computer app for Android smartphones that displays and records performance data for the cyclist. Cykelstrom calculates an estimate of power expenditure of the cyclist using the sensors in the smartphone and/or external sensors. If you would like to learn more about how to use Cykelstrom please visit Using Cykelstrom On Your Ride.

Accuracy Of The Bicycle Computer App For This Ride

The best accuracy is highlighted in bold.

Sensors	Crank Power Meter (Watts avg.)	Cykelstrom (Watts avg.)	Difference (Watts)	Margin of Error (Watts)
External Speed and Cadence	146.24	150.86	4.62	+/- 1.38
GPS Speed and External Cadence	146.24	146.88	0.64	+/- 1.32
External Speed Only	146.56	155.58	9.02	+/- 1.49
GPS Speed Only	146.56	151.42	4.86	+/- 1.41

Strava Activity

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The Cykelstrom Bicycle Computer App Is Only Available on Google Play