I’ve used a Stages LR dura ace powermeter for several years without issues. Moved to shorter cranks and have been using a 4iii dual sided dura ace powermeter for the past several months as I couldn’t find a Stages LR in that crank length. I’m a bit frustrated with the number of dropouts I’m having w…

The left side is accurate. The problem arised because the right crankarm is asymmetric, and this asymmetry is hard, almost impossible to compensate for. This is not 4iii’s fault, it’s on Shimano. And it is shared by all right-side power meters based on modern DuraAce and Ultegra cranks, including Sh…

We get power meters because we hope they’ll help us answer hard questions that can’t be answered with a HRM or a speedometer or a stopwatch. When in that situation, trying to resolve a hard question, you don’t want the additional question, “Is this power meter right?” As long as there are alternativ…

So do Shimano-based LR powermeters read lower? Or is it that they are less precise so you can’t depend on day to day consistency? I’m having trouble interpreting the said inaccuracies of the right sided crank.

Power meters based on the Dura Ace and Ultegra cranks are unpredictably accurate because of the right crank arm. That’s on top of any other any other problem you may be having, such as drop-outs, or in fact other inaccuracies because of the accelerometer-based cadence measurement. That is to say, cr…

Keith Wakeham made a nice video about it a year ago…

Thanks, everyone. I decided to go for a Quarq powermeter with Shimano 9100 chainrings. Hoping this will solve my drop out issues and also some peace of mind given the concerns about accuracy with Shimano-based powermeters.

Shimano dual sided power meter accuracy

Equipment

CapraHam11 April 19, 2021, 4:57am 3

I read your review and take it that the right PM reads low. What about the left? Does that mean the overall value reads low thus the concern with accuracy?

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Shimano dual sided power meter accuracy

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