Cycling Power Meter App Cykelstrom developer Chuck is starting to live stream his rides on YouTube. You can interact with Chuck through the YouTube chat window. This is a perfect time to talk to Chuck about the app. It’s also a great time to ask questions or say hello.
If you would like to see more Cykelstrom Bicycle Power Meter App videos, please visit @Cykelstrom on YouTube and remember to “Like” and “Subscribe” to our channel.
Bicycle, Smartphone, Sensors and Live Stream Equipment
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. A Polar H7 chest strap sensor collected heart rate information. The smartphone was a Motorola G6 running Android 9 and Cykelstrom version 1.73. The the Cykelstrom Bicycle Power Meter App collected the power meter and sensor data, saved it locally and automatically uploaded the data to Strava at the end of the ride.
A helmet mounted Ghost X action camera captured the live stream video. A Moxee 4G Lte WiFi hot spot sent the live stream to an Nginx server and streamed to YouTube with OBS Studio. The Prism Mobile App captured the Cykelstrom Cycling Power Meter App screen. I’ve attempted to keep the live stream equipment as simple as possible. Data stream cell service can be marginal at times when getting away from the city. I used the audio from the smartphone with a rudimentary home made wind screen. I am going to experiment with using the Ghost X camera audio with a windscreen in upcoming rides.
Cycling Power Meter App Accuracy For This Ride
Best accuracy for this ride is emphasized in bold type.
| Sensors | Crank Power Meter (Watts avg.) | Cykelstrom (Watts avg.) | Difference (Watts) | Margin of Error (Watts) |
| External Speed and Cadence | 123.29 | 134.91 | +11.61 | +- 1.572 |
| GPS Speed and External Cadence | 123.29 | 131.29 | +8.00 | +- 1.524 |
| External Speed Only | 124.36 | 147.66 | +23.30 | +- 1.806 |
| GPS Speed Only (no additional sensors) | 124.36 | 143.37 | +19.01 | +- 1.757 |
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 bias of 8.00 +/- 1.524 Watts which is an average difference of about 6% for the best case scenario. The worst case scenario shows a bias of 23.30 +/- 1.806 Watts, which is an average difference of about 19%. When calibrated correctly, Cykelstrom provides acceptable power measurements for the the recreational cyclist. If these results are not acceptable, Cykelstrom also connects to any Bluetooth power meter and the cyclist benefits by being able to see the power estimate fractions committed to wind resistance, rolling resistance, or grade assistance/resistance due to gravity.
To see answers to commonly asked questions about Cykelstrom visit our FAQs
Strava Activity
Click on the map to visit this activity in Strava.
| Elapsed Time | Moving Time | Distance | Average Speed | Max Speed | Elevation Gain | Calories Burned |
|---|---|---|---|---|---|---|
|
01:44:27
hours
|
01:44:27
hours
|
26.08
mi.
|
14.98
mph
|
22.91
mph
|
457.02
ft.
|
1,028
kcal
|
The Cykelstrom Mission
The Cykelstrom mission is to maximize the ability of the athlete to utilize the technologies inherent in their existing Android smartphone to provide performance data for improvement of their physical fitness at little to no cost. The acquisition of athletic performance data can be expensive and out of the reach of many. Cycling power meters can often exceed the cost of the bicycle. Cykelstrom is an alternative that gives useful training data with out the expense.
The Cykelstrom Cycling Power Meter App leverages technology in newer and older smartphones. I attempt to make Cykelstrom backward compatible to the oldest Android operating system as practical. An old smartphone makes an excellent bicycle computer. Cykelstrom uses cellular data service, but it is not absolutely necessary. You can manually enter weather information and still get a good result.
Giving your old smartphone a new or dedicated mission helps keep it out of the landfill and delays the need for recycling.
The Cykelstrom Cycling Power Meter App is provided at no cost, but that doesn’t mean it’s development and data feeds are free. Please consider supporting the development of the Cykelstrom Power Meter App by “Buying Me A Coffee”.
The Cykelstrom Road Bike Power Meter App Is Exclusively Available On Google Play
