Dobra, ja zacząłem inny temat drążyć. Mierniki vs owalne tarcze. To co się dowiedziałem póki co.
1. reakcja różnych mierników jest bardzo różna
2. zazwyczaj pomiar jest zawyżony od 1 do 5%
3. power2max jest niewrażliwy na owale, wynika to z tego, że nie bierze kadencji pod uwagę całościowo podczas pomiaru, ale cząstkowe informacje z każdego obrotu z accelerometera
4. quarq - pod recenzja dcrainmakera znalazlem wypowiedza kolesia z quarq (z 2017), który napisał, że wraz z upgrejdem softu problem będzie rozwiązany. Napisałem do supportu aby to potwierdzić.
Favero Assioma
The Favero Assioma uses IAV Power Technology (Actual Instantaneous Angular Velocity) to correct for any inconsistencies in pedal speed. IAV allows the Assioma DUO and UNO to measure the true pedaling speed within each pedal stroke. This eliminates the issue of inconsistent pedal stroke revolutions caused by oval rings. Perhaps even better, IAV also improves the accuracy of the Assioma to +/-1.0%.
Garmin Vector 3
Garmin states the following regarding the Garmin Vector 3: “[The Vector pedals] assume constant angular velocity within a single crank revolution. For most riding conditions and bike set-ups, this assumption allows the Vector systems to report power within its stated accuracy. Garmin has not determined how variable the angular velocity is when using the elliptical rings in real riding conditions. Because of this, we are unable to state what impact would appear on power values. For the best accuracy, it is advised that when using a Vector system, it should be installed on a circular ring set.”
This is just a thorough way of saying they cannot attest to what impact, if any, oval rings might have on accuracy. I would suspect that the impact with Garmin Vector’s wouldn’t be much different than that with any other power meter. In fact, we have a customer that has compared their Vector’s with a Q-Ring to a PowerTap G3 hub. He reports that the difference was negligible.
power2max
power2max power meters are claimed accurate with oval rings by the manufacturer. Specifically, power2max says the cadence interval on their power meters is not discrete per crank revolution. Rather, the accelerometer data is sampled continuously, just like power data. In other words, they don’t make the assumption that pedaling velocity is constant and therefore, are not impacted by the use of oval rings.
PowerTap P2 Pedal
The PowerTap P2 power meter perfectly supports non-round rings according to PowerTap. PowerTap says, “The P2s take 40 individual angular velocity measurements and subsequently 40 power measurements per pedal stroke. Any acceleration/deceleration within a pedal stroke would be measured.” In other words, the P2 Pedals account for the fact that your pedaling velocity changes when using an oval ring, and therefore your power data remains precise.
PowerTap G3 Hub
Since the PowerTap G3 measures power at the hub, your pedaling velocity is irrelevant. A hub-based power meter doesn’t see or care what type of chainring you’re using. Rather it simply measures the power or torque at the rear wheel. Therefore, the G3 power meter works fine with oval chainrings.
ROTOR 2INpower DM
There’s no crankset-based power meter more Q-Ring compatible than the ROTOR 2INpower DM Power Meter. Not only is the ROTOR 2INpower certified accurate with a Q-Ring, but ROTOR power meters feature OCP (Optimal Chainring Position) technology which allows you to adjust your Q-Ring position with a great degree of precision. By fine-tuning the position of your Q-Ring, you can set your pedal stroke to best take advantage of your Q-Rings and get the most power and pedal efficiency out of your crank.
Stages Cycling
Mechanically, the Stages power meter works with oval chainrings. However, they note that their power measurement is “event based, where as an event is one complete pedal revolution”. Like Garmin, due to the angular velocity inherent in oval rings, they note that power will likely be skewed higher. They estimate it can be as much as 4-5% higher. They emphasize that it is indeed fine to use oval rings with a Stages power meter. However the rider simply needs to take this difference into account when using their Stages power meter with an oval chainring.
Verve InfoCrank
Note that due to the thickness or depth inherent in some oval rings, the oval chainrings can interfere with the RF module cover on the inside of the Verve InfoCrank drive side crank arms. We have had some customers actually drill out an area on the chainring for the module to fit. So the InfoCrank power meter can be used with an oval chainring, but it’s takes a bit of work. (Not an accuracy concern, but rather a comment on compatibility.)
https://powermeterci...val-chainrings/
pewnie dużo się zmieniło do dnia dzisiejszego, ktoś coś?
Myślę poważnie o owalu do MTB, stąd research.