Its Certificate of Conformity reads: "Solely certified for Specialized Electrak 2.0 Armadillo tyres". Take the Specialized Turbo Vado 6.0, EU version. For this reason, the speedometer of the S-Pedelec cannot show actual speed lower than the actual, and the odometer should be quite accurate. The EU S-Pedelec (like, Vado 6.0, Allant+ 9.9S and similar) has to be certified for conformity, as it is perceived by law as a moped, or a motorised vehicle. There is a single e-bike situation that resembles the car: The European S-Pedelec, or, the EU 45 km/h e-bike. The odometer/daily trip meter readouts are - on contrary - quite fine. Have you noticed the actual speed of the car given by its speedometer is often overestimated, compared to the GPS readout? It is legally fine because the reported speed makes you actually drive slower, thus safer.
Given measured rotational speed of the wheel, the distance ridden and actual speed should be the most accurate. A predefined value of wheel circumference is stored in the e-bike's computer/controller. A magnet for the speed sensor is located either at a rear wheel spoke (less accurate) or at the brake disk (more accurate). Theoretically, measurement by e-bike should be the most accurate. If you want to be honest (or mistrust the GPS measurement), you can make the distance and elevation figures corrected by map, which gives the most conservative estimate of your effort.Į-Bike Measurement (Distance/Elevation Gain/Speed) For this reason, Strava offers Distance and Elevation Gain Correction Tools.
Suffice to say, the Austrian scientists have mathematically proven that GPS will overestimate the value of the distance ridden. That article is too complicated for me to really comprehend it. Why GPS makes distances bigger than they are Ride recording based on GPS is a different matter. GPS navigation works perfectly, even for bikes. In any case, the map is the reference to which we all need to adhere for comparison. As has correctly stated, a bike doesn't ideally follow the route as it doesn't move in straight line really ( on contrary, marathon champions are being guided to run over the shortest route possible). No doubt, a digital map including elevation profile, would give the most conservative distance value between points A and B over defined route. The accuracy of GPS based apps such as Strava is rather spotty related to time measurement (it can differ from e-bike display value by many minutes on a long ride). That is, ride time measurement is being paused when the measured ride speed falls below some predefined value (and is restarted after the bike speed exceeds that value). GPS sports trackers feature some kind of "auto-pause" or "auto-stop". E-bikes featuring ride time measurement give the net (or moving) riding time very accurately: The time is being metered from the moment the rear wheel starts rotating to the wheel stop. There is one ride parameter that is handled quite well (although not perfectly) by e-bike displays: The net riding time. Shall we try again? Let us discuss it once and for good.
This has been already discussed in many threads in different EBR Fora without any real conclusion.
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