Revolutions power sports calculator9/21/2023 ![]() ![]() ![]() If you suspect there is a problem with the distance recorded by your device, you have the option to override your device's distance with the Strava post-upload approach. Cons: Common problems with relying on a wheel sensor include: wheel size is not documented accurately, the device is moved to another bike with a different wheel size and not adjusted, the Auto wheel size is calculated wrong either because of GPS inaccuracies or because the magnet did not count every wheel revolution.This could become a slightly more significant factor for mountain bikers who gain and lose a lot of elevation gain rapidly. Pros: A wheel sensor will capture vertical speed and the additional percentage of distance accumulated with elevation changes.Speed/Cadence Sensor Garmin GSC-10 approach: Ground Speed distance is measured by counting the wheel revolutions and then multiplying by the wheel circumference.Similar to the above, straight lines connect the GPS points. Cons: A flat surface is assumed, and vertical speed from topography is not accounted for.Pros: Post-upload GPS-based distance can eliminate problems like stuck points (see above) and create smoother, more accurate distance data than the device equivalent.You can elect to use this method if you suspect there is a problem with your device's recorded distance (see reverting distance.) This is how Strava determines distance for any uploaded file that does not include a distance stream. At this time, a calculation can be run on the GPS coordinates to get the distance. GPS-based, Strava post-upload approach: After GPS data is recorded and uploaded to Strava, the data is parsed into streams of data and analyzed.This calculation method does not capture variations in the route between GPS points and may vary further when battery-saving features are enabled. Also, some accumulated distance may be lost as straight lines connect each GPS coordinate instead of an arc. Since this is a GPS-calculated distance, a flat surface is assumed, and vertical speed from topography is not accounted for. Cons: The complicated nature of this "real-time" calculation can lead to stuck points, where no additional distance is recorded from the previous point, which can cause some Strava calculations like Estimated Best Efforts for Run to fail.Pros: Refined calculation to gather distance data built into the file in the distance stream, measured in meters.GPS-based device approach: The Strava mobile apps and many GPS devices will calculate your distance accumulated in "real-time" while the device is recording based on the GPS data.Each method of gathering data can and may introduce some inaccuracy. Ground speed will measure your speed along the surface you are traveling (counting the revolutions of a wheel), and GPS-calculated distance will "connect the dots" between your GPS points and triangulate the distance between the coordinates. There are two main ways to calculate the distance for most sports - Ground Speed Distance and GPS-calculated Distance. Therefore, distance is mostly a personal metric and statistic, except when Strava runs a distance-based challenge, like the monthly distance challenges, and in that case, the distance would be competitive. Segment times are based on when you cross the start and endpoints of a segment. Distance does not, however, contribute to your segments or segment times. Additionally, distance readings contribute to your average speed, as average speed is calculated from distance over your total moving time. On Strava, distance contributes to your overall distance totals, whether in your Training Calendar, the bar graph on the Profile page, or your overall and yearly stats in the Profile sidebar. In contrast, most GPS devices tabulate these values on the device itself. Still, any minor inconsistencies are likely due to number crunching on both ends - Strava processes and analyzes the data in the file independently. Under normal conditions, differences should be minimal when comparing distance or speed metrics on Strava versus the GPS device. Depending on which method for recording distance is used (see explanation below), that data will be reflected in the distance stream and thus on Strava. When a GPS file is uploaded, Strava takes the distance data recorded in the file and parses it into a data stream to calculate total distance, average speed, and max speed. How Strava measures and displays distance How Strava measures and displays distance.There are a few ways to gather distance data while recording a GPS-based activity Distance is the most basic training statistic - therefore, being confident in your distance data is important. ![]()
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