Just to be clear: We are talking +/- 2% here, so you won’t even notice it, if there is any inaccuracies. Riding at 300W that means +/- 6W at most. I’ve had both Sigeyi and Power2Max and there is no noticeable difference.
Sigeyi Axo Power Meter Spider
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The P2M I have is an older battery unit, and its been bulletproof on a gravel bike. The Sigeyi is about a year old, on my primary road bike, and has been flawless. The accuracy is in line with my other units (not that I've graphed and tested, but looking at power files on identical courses). The Sigeyi app allows you to scale if needed, but its applied across the board, so not sure that its really useful as when I've I seen inaccuracies with pm's its generally been in response to rapid surges etc rather than something steady state.
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doesn't having access to scale your PM numbers open a whole can of worms re: power doping on Zwift?glepore wrote: ↑Tue Oct 11, 2022 9:00 pmThe P2M I have is an older battery unit, and its been bulletproof on a gravel bike. The Sigeyi is about a year old, on my primary road bike, and has been flawless. The accuracy is in line with my other units (not that I've graphed and tested, but looking at power files on identical courses). The Sigeyi app allows you to scale if needed, but its applied across the board, so not sure that its really useful as when I've I seen inaccuracies with pm's its generally been in response to rapid surges etc rather than something steady state.
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Many power meters allow you to set a scale factor.
Every power meter pedal must have a user-defined crank length. You could easily double your power by defining a crank length of 350mm.
And of course in a situation like Zwift you could literally just create stream fake power data over ANT+ all day.
Checking in.... This is why it's useful to have three power meters when testing if possible. And/or to get a shitton of repeated data sets to be confident.
The Favero pedals are good, damn good. They're not perfect. More on this one day... maybe...
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Curious, is there a perfect powermeter?
No. There's some really shitty ones out there though.
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I have 2 pairs of Feveros and 2 PowerTap wheels. The Faveros read about 2% or 3% lower than the PowerTaps.
The curious thing is that comparing smoothed 5s data sometimes they read near identical for as much as 20 or 30s, and sometimes there's a gap. No idea why
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*cough* SRM *cough*robbosmans wrote:Curious, is there a perfect powermeter?
Sorry. Had to laugh at this.
The only way Shimano buy them out is if they get wind of one of their potential competitors buying them, say FSA (who were sniffing around Pioneer), or one of the upcoming Chinese outfits.
If they do it, it's very likely they do exactly what they did with Pioneer. After a few months begin making all the staff redundant, shutting the company down, and killing support for all the products and infrastructure.
Also, improve / innovate? Come on ... you yourself were scathing about their latest PM failure.
I'd rather LTWOO or Sensah bought them. Though the chances of them being able to outbid Shimano are nil.
But maybe you're talking about an ideal world where Shimano isn't just out to stifle competition and innovation.
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Sure, they came out with a bad product but I don't think I've seen you test their spider based power meters. I've had 2 dzero dub PM's recently that had up to a 5% left right discrepancy and power over read on them up to 8% high as force increased. This is based on calibrated weights and baseline hill repeats. I can't even keep the Quarq baseline consistent with static load whereas my daily driver SRM is reading within 1% of when I last tested it a year ago. I've also had two other dzero dub that output weird numbers too but I didn't check LR readings. Either way, it's something that I haven't seen you or DC Rainmaker point out.
At the end of the day, a power meter is a training tool and its sole purpose is to give reliable data. Stages, Quarq and Shimano don't meet that mark. I have tons of data to prove that. SRM may not have the latest features but it's the only PM that I don't have to worry if the numbers on the screen are off or not.
I'm a data geek like you, so I've had about 40 PMs come through my hands (over half of them SRM - I have 6, going on 7 SRMs at the moment). I calibrate all of them with a certified weight and validate their outputs on a fixed distance steep hill. My calibrated SRMs match SRMs that just come back from Colorado (within 0.5%). My other PMs are all over the place.