Cuyuna Country State Recreation Area Galloping Goose Trail located in Ironton, Minnesota was a late summer get away mountain bike ride.
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Trail Pic
Cuyuna Country Galloping Goose Trail Cykelstrom Accuracy
The best accuracy is highlighted in bold.
| Sensors | Crank Power Meter (Watts avg.) | Cykelstrom (Watts avg.) | Difference (Watts) | Margin of Error (Watts) |
| GPS Speed and External Cadence | 72.40 | 88.67 | 16.27 | +/- 3.05 |
| GPS Speed Only | 72.40 | 107.68 | 33.70 | +/- 3.65 |
Cuyuna Country Galloping Goose Ride’s Results
This was the first visit for Stacey and me to the Cuyuna Country State Recreation Area Galloping Goose Trail. The bicycle for this ride was a Trek Top Fuel 8 full suspension cross country mountain bike with 100mm of travel. Galloping Goose is a flowy trail with many short punchy climbs. The power distribution of the Cykelstrom app shows a higher than normal frequency of low power observations when compared to the crank power meter. I suspect that the difference in the curves was due to higher than normal frequency of braking to keep a safe gap between Stacey and I while riding. The Cykelstrom data on average was within 22.4 percent of the single sided crank power meter which may be acceptable to most recreational rider’s on a trail like Galloping Goose.
Validating Accuracy For Cykelstrom
Bland-Altman Analysis is a frequently applied technique to investigate the agreement between two methods of measuring the same thing. In this application we are measuring the instantaneous power of the cyclist using the Cykelstrom Bicycle Power Meter App (blue) and a single sided crank power meter (red) in the figure above.
The distribution of dots in the plot below represent the difference of the two measurement methods versus the average of the two measurement methods. If the dots are evenly distributed above and below the zero line there is no bias between the two measurements. In this ride, there is a 16.27 +/- 3.05 Watt bias. The smaller the bias and margin of error the better the two measurement methods agree with each other. We use Bland-Altman Analysis to validate the accuracy of the Cykelstrom Power Meter App. We are constantly tuning our calculated power estimate to be as accurate as possible across mountain, gravel and road bike designs.
Importance of Calibration (The RED Dot)
The most important factor that is within a rider’s control to get an accurate calculated power estimate is to calibrate Cykelstrom on a flat and level surface before a ride. After you have securely mounted your smartphone on your bike, sit on the seat in your normal riding position and press the “Red Dot” on the face of the Cykelstrom App. You should see the grade percentage reset to near zero or level. Once calibrated, Cykelstrom will remember this initial position until you press the “Red Dot” again. Recalibration is not necessary unless you change the angle of your phone mount or change bikes.
To learn more about calibrating Cykelstrom please read the article “Setting Cykelstrom Up For The First Time.”
Strava Activity For Cuyuna Country Galloping Goose
Click on the map to visit this activity in Strava.
| Elapsed Time | Moving Time | Distance | Average Speed | Max Speed | Elevation Gain | Calories Burned |
|---|---|---|---|---|---|---|
|
01:06:06
hours
|
00:54:23
hours
|
6.97
mi.
|
7.69
mph
|
13.90
mph
|
312.01
ft.
|
627
kcal
|
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The Cykelstrom Bicycle Power Meter App Is Only Available On Google Play
