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Re: ArcRayo Powermeter I have it on good authority that GP Lama is testing this at the moment. (Ie his Instagram  ;D )

Will be interesting to see if this is competitive. Wonder what the minimum chain ring size would be, cheap option for gravel bike.
October 17, 2025, 04:18:26 PM 		1
Re: XCADEY VENTUS Carbon Cranks + PM Some fairly substantial accuracy issues reported by GPLama (above) now in fuller form on YouTube:

https://youtu.be/f7P8IvtEmlo?si=0bzRAFTVWvF4hLLe
November 23, 2025, 03:21:45 PM 		1
Re: XCADEY VENTUS Carbon Cranks + PM
Quote from: gplama on January 14, 2026, 06:07:48 PM
Boom. There it is on the XCadey, cadence sensing issues in peak power acceleration/sprints. I'd consider that in-line with my testing scope. And unfortunately for XCadey, in-line with my results.

I have talked to xcadey for months about the calibration and try to improve their discrepancies with power.  What they dont understand is that to be accurate there are a minimum of 3 pts in calibrations is needed not just 1
My explanation is
Power = Torque x "rpm" 
Torque from sensor is accurate but its assumed a linear relations ship [ Y=mX+C ]  where C is the offset at zero - That is the calibration number....  And m (slope) is fixed at the factory and its fairly accurate but when manufacturing deviates a tad that "m" is off and cannot be changed -  Thats why i propose a 2 point calibration (like the old Quarq) by placing a known weight to get the 2nd point.
now for cadence where the biggest issue with new power meters that dont use a magnet for rpm... the rpm can be all over the place and delayed and if using the peak of the sensor and average the time between a small amount of peaks that is problematic.....

I gave up trying to explain my case to them

January 16, 2026, 06:46:38 PM 		1
Re: Leoseek power meter spider - USB-C charging
Quote from: kozak567 on January 25, 2026, 02:59:53 AM
I compared it to assioma and this PM looks fine, on picture on the left leoseek on the right assioma

That does not look "fine" to me, that's pretty shit actually.
February 03, 2026, 07:39:16 AM 		1
Re: Thinkrider PP5 power meter
Quote from: Super_davo on February 18, 2026, 01:41:03 AM
Fantastic work as ever GP Lama.

I can see the clear, repeatable issue - but I also think for the bike I intend to put it on I am almost never going to expose it to that issue (the chances of me doing 1000W sprints on my winter bike are practically zero...). In that case - it looks pretty accurate - and certainly way more accurate than single sided when I know my L/R balance is not consistent.
It seems the power meter has issues with residual torque after any high torque work. It doesn't have to be a proper sprint - even weak acceleration (~800 W) triggers the drift. In real world 2-3 sec long revolutions at high torque happen all the time: when you want to overtake someone, kick start on a traffic light, or during loss of traction on loose surfaces (sand, snow etc.).

We don't know the lower threshold where the drift is triggered but it looks like it may work in a very narrow set of cases where you don't accelerate at all.
February 18, 2026, 02:06:47 AM 		1
Re: Thinkrider PP5 power meter
Quote from: 00Garza on February 18, 2026, 02:10:59 PM
Wishful thinking, but is it possible that Gplama was sent a dud? Has anyone else tested accuracy post sprint?

At that price point though, I'm not surprised it has some issues.

Whenever he tests one there is always this talk that he may have received a dud one.. When he tested elilee they said the same thing.. I think we have to get it into our heads that true quality has a price. The good example of this is the Chinese bicycle brands that are also getting high prices because they have quality. My impression is that all these power meters are made in the same factory and with the same parts, that's why they all fail!
February 18, 2026, 04:00:22 PM 		1
Re: Thinkrider PP5 power meter
Quote from: rene2879 on February 21, 2026, 10:55:48 AM
I would be interested if ThinkRider is able to fix the residual error with a software fix.

Good luck
February 21, 2026, 04:47:31 PM 		1
Re: Nexga S1 Haven't seen it so far and the master mind of power meters, aka GPLAMA, has nothing on his channel as far as I know.
https://www.youtube.com/@gplama/videos
Once he approves it, it would be an attractive option but I'm actually concerned about the charging port. An IPx7 rating appeals nice but riding in the wet requires more.
IPx7 specs the gentle submersion for 30 minutes, resulting in an even pressure on the cover. Riding at high speeds in the rain is very different...
Yet the appeal of USB-C charging is quite tempting.
March 29, 2026, 09:54:56 PM 		1
Re: XCADEY VENTUS Carbon Cranks + PM
Quote from: gplama on March 31, 2026, 01:02:05 AM
I'll re-test at some point.

iirc someone said they removed the real time offset reporting in their app? If they have, that's a step backwards. Also raises questions as to why they'd do that as it was extremely useful in debugging issues.

Yep, it no longer shows the offset. Very annoying.
April 01, 2026, 11:51:16 AM 		1
Re: XCADEY VENTUS Carbon Cranks + PM No surprise, really. So this one and the Coospo that I basically just ordered out of curiosity are more or less for the bin. I‘m sure that they‘ll eventually figure it out, but the common AE rule applies: don‘t buy stuff from the low end of the price spectrum.
April 02, 2026, 04:06:37 AM 		1