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Magene P505 PES Base Spider Powermeter

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Avalius:
Hey guys,

Any reviews on these units?
Saw gplama his youtube video about it and thinking about ordering one.
He was very positive about it and the price is very good.

raisinberry777:

--- Quote from: Avalius on November 10, 2023, 03:24:43 AM ---Hey guys,

Any reviews on these units?
Saw gplama his youtube video about it and thinking about ordering one.
He was very positive about it and the price is very good.

--- End quote ---

Can't give it so much of a detailed review, but I got mine ~2 weeks ago and have been happy with it so far. Using it on an otherwise R7170 105 Di2 setup (including 105 R7100 chainrings) and it works excellently. Had to adjust the FD a bit as the crank sat slightly more outboard but obviously that's very easy with Di2! Setup was simple - old crank out, take chainrings off and put them on new spider, use external lockring tool to attach spider to crank, then it's just a couple hex keys to install. No harder than a Shimano crank.

Numbers are comparable to my Favero Assioma Unos which I had until recently before the bearings wore through the axles. No dropouts or spikes at all. Haven't had to charge it yet so can confirm that it lasts at least 500km without having given a low battery warning yet.

electrolux:
I have had mine on the Zrace cranks for a few months, first power meter so nothing to compare but no issues. The app is a bit janky but it does the job.

sbellote:
I have the P325cs from Magene, got it in the crowdfunding, it's been 3yrs and working really well, although it's the 1st PM and I don't have much to compare to, the readings are aligned with my smart trainer so it's a good sign. Only thing that could be better is the battery, but it lasts about 60hrs of usage so it's still pretty good, and easy to charge, so not so bad.

I think the best opportunities are either those P505 or the Sigeyi, which are pretty well established
keep a lookout tomorrow with the start of 11.11 because the price might drop and it adds up with coupons. If you look now the product pages show the current price and what'll be tomorrow in sale

Eddy_Twerckx:
I have the P505 Base with the cranks from Magene. Price was $300 USD with free shipping. Installation was very simple. Straight swap from my Shimano 105 cranks, preload the non driveside and then a single pinch bolt. I'll post the weights below. So far, data has been tracking spot on with my Favero Assioma pedals except in one condition. It does not work well with oval chainrings...sort of. So my setup is a little weird. I do a round outer ring and an oval inner ring. This is why the Magene has problems. It's a well documented "issue" that spider power meters overestimate oval chainrings. Which isn't a problem in itself because you can adjust the offset of the PM. So if you're running a single ring oval, just can adjust it down to be accurate. Or if you're running 2x oval. The problem I'm having is that it's accurate for the round outer ring, but reads high when in the small oval ring. My solution is that I ordered a round inner ring. It's on the race bike and I wanted to get bigger chainrings anyways, so I'm fine with using round rings. The other option would have been to just know in my head that the readings were 10W off in the small ring, but my solution seemed simpler.

Overall, very happy with it. I wanted a cheap, accurate PM for my crit bike and this is it. Easy swap if you're running Shimano, and very accurate readings with round rings. I would buy again for sure. Magene is also making a pedal PM that looks promising but it's going to be a bit more expensive.

Weights
PM Spider: 112g
Driveside crank arm and spindle: 312g
Non driveside arm and preload bolt: 213g
Total weight (no chainrings): 638g

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