Other Resources > Component Deals & Selection
Magene P505 PES Base Spider Powermeter
00Garza:
--- Quote from: TidyDinosaur on November 15, 2023, 01:35:56 AM ---The Q-factor of the crank is narrow (like Shimano road), so if you are prone to heel strikes it might not be the best choice. I first wanted to order it with the crank, but the Q-factor made me decide to go with only the powermeter and use my current crank.
The weird powermeter-crank interface also does mean you can't just switch to another crank.
--- End quote ---
Just pulled the trigger on one. I ride flat pedals on my gravel bike, so hopefully that should help minimize the heel strike issue.
kubackje:
Did anyone use this magene powermeter with senicx gr2 crankset?
https://a.aliexpress.com/_EwEflTP
Sebastian:
I got the P505 in the SRAM 3 bolt variant on my Red crankset. I think it’s slightly overreading compared to the Assioma pedals on my other bike. I could scale it down in the app but I need to put the Assiomas on the bike to compare them directly. Other than that the thing is bomb proof.
nickobec:
--- Quote from: Sebastian on November 19, 2023, 02:52:51 PM ---... but I need to put the Assiomas on the bike to compare them directly ...
--- End quote ---
Easy to do if you have two head units, https://compare-the-watts.com/ is your friend. Just test my old G3 hubs, a Sigeyi for my gravel bike and my Assiomas. Surprised how everything is within 1%, except one hub that is closer to 2%.
TidyDinosaur:
--- Quote from: nickobec on November 20, 2023, 06:27:01 AM ---Easy to do if you have two head units, https://compare-the-watts.com/ is your friend. Just test my old G3 hubs, a Sigeyi for my gravel bike and my Assiomas. Surprised how everything is within 1%, except one hub that is closer to 2%.
--- End quote ---
Well, you have the drive train losses between crank and hub... Maybe that can explain. I find 2 % still VERY good.
And yeah, without testing them both at the same time on the same bike you can say nothing about the differences between 2 measurements.
If both devices have a 2% accuracy they can have a 4% difference and still be within tolerances...
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