Chinertown
Other Resources => Component Deals & Selection => Topic started by: Avalius on November 10, 2023, 03:24:43 AM
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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.
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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.
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.
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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.
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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
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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
(https://i.imgur.com/UPk2Ihih.jpg)
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Looking at one of these myself for my gravel bike. Anything to keep in mind if setting it up 1x? Any recommendations on good Ali chainrings to pair it with?
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Looking at one of these myself for my gravel bike. Anything to keep in mind if setting it up 1x? Any recommendations on good Ali chainrings to pair it with?
I have a 36t deckas chainring on my CX rig. It's fine, it's the cheapest narrow-wide chainring I could find for 36t. No real complaints here!
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Just ordered the P505 (without crank). I'm going to put it on my gravel bike with 38t chainring and the Sigeyi Powermeter that is now on my gravel bike will go to the MTB (it's 104BCD).
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Looking at one of these myself for my gravel bike. Anything to keep in mind if setting it up 1x? Any recommendations on good Ali chainrings to pair it with?
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.
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I've ordered 3 of these with the 11.11 action. I'll report later with additional feedback. 2 for my road bikes and 1 for my gravel bike.
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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.
Just pulled the trigger on one. I ride flat pedals on my gravel bike, so hopefully that should help minimize the heel strike issue.
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Did anyone use this magene powermeter with senicx gr2 crankset?
https://a.aliexpress.com/_EwEflTP
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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.
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... but I need to put the Assiomas on the bike to compare them directly ...
Easy to do if you have two head units, https://compare-the-watts.com/ (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%.
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Easy to do if you have two head units, https://compare-the-watts.com/ (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%.
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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Powermeter pedals and the Spider based powermeter both measure before drivetrain losses. Both have a claimed accuracy of 1.5%. The deviation I think I’m seeing is more though. BUT - I had the Magene on my gravel bike and the Assiomas on the road bike. First time ever that I’ve used a PM on gravel so no data to go from and it might just be that my rides off road were harder than on road. Now that I moved my Magene to the 2nd road bike, it’s actually closer to my Assiomas. But it still seems higher. Need to put the Assiomas on there and compare the readings directly but so far I just couldn’t be bothered.
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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.
Oval rings by any chance? My Magene on oval rings reads higher than my Assioma. On round rings they’re within a watt. It’s easy enough to scale down once you get an offset from testing.
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Well, you have the drive train losses between crank and hub... Maybe that can explain. I find 2 % still VERY good.
Testing I did with the older of my Powertap G3 hubs, Sigeyi AXO spider and Favero Assioma pedals was 1% between all 3 power meters. It was steady state longer rides. Somehow the Powertap even with drive train losses (it is a efficient drive train) was really close to the crank and pedals readings.
My newer Powertap G3 hub compared to the Favero Assioma pedals was out by a little over 2%, but with a little digging, retesting and calibrating. It is close to 1% for steady state rides. However, sprints (or hard efforts) both Powertaps over estimate my power (say 5% for 1 minute all out).
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Oval rings by any chance? My Magene on oval rings reads higher than my Assioma. On round rings they’re within a watt. It’s easy enough to scale down once you get an offset from testing.
Nope. Regular round rings. I’ll give it a go on the turbo in the next few days and report back what the offset is. Or maybe it was just my subjective feeling.
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So I put the Assiomas on the bike. I did a ramp test and a quick workout in Zwift and recorded both the Magene P505 and the Assiomas.
The Magene consistently overreads by around 5% while the cadence is pretty much identical on both units. I did a zero calibration with both units prior to comparing them.
I adjusted the power scaling accordingly in the Magene Utility app. I'll give it another go shortly to see if I can get them to match up.
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So I put the Assiomas on the bike. I did a ramp test and a quick workout in Zwift and recorded both the Magene P505 and the Assiomas.
The Magene consistently overreads by around 5% while the cadence is pretty much identical on both units. I did a zero calibration with both units prior to comparing them.
I adjusted the power scaling accordingly in the Magene Utility app. I'll give it another go shortly to see if I can get them to match up.
Just a clarification. Is the higher reading from the Magene while you ride? Or did you do an analysis of the power data after recording? If you’re just looking at the two numbers during the ride it may be hard to get an accurate comparison based on how each unit reports the data. The best way to do it record each device to a separate head unit, or one device to Zwift and one to a head unit. Then pull each file and do a direct comparison. ZwiftPower has a free tool. DC Rainmaker has the most well known but costs money. There are some others out there.
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Just a clarification. Is the higher reading from the Magene while you ride? Or did you do an analysis of the power data after recording? If you’re just looking at the two numbers during the ride it may be hard to get an accurate comparison based on how each unit reports the data. The best way to do it record each device to a separate head unit, or one device to Zwift and one to a head unit. Then pull each file and do a direct comparison. ZwiftPower has a free tool. DC Rainmaker has the most well known but costs money. There are some others out there.
I've used this in the past: https://compare-the-watts.com/
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Just a clarification. Is the higher reading from the Magene while you ride? Or did you do an analysis of the power data after recording? If you’re just looking at the two numbers during the ride it may be hard to get an accurate comparison based on how each unit reports the data. The best way to do it record each device to a separate head unit, or one device to Zwift and one to a head unit. Then pull each file and do a direct comparison. ZwiftPower has a free tool. DC Rainmaker has the most well known but costs money. There are some others out there.
I’ve used compare-the-watts.com and recorded both powermeters. One with Zwift and one on my Wahoo.
The average wattage for the Magene is 5.14% higher than the Assiomas according to the website.
Looking at the power curve, the deviation is pretty much consistently higher by 5%, meaning that the gap increases, the higher the wattage.
Thanks for the tip with this website by the way. I did use DC Rainmaker’s tool in the past. This is just as good.
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So weirdly enough, just when I was doing my 2nd test run with the Assiomas and the Magene P505 whilst messing around with the power scaling in the Magene app, a new firmware update popped up. After installing it, the Magene PM is now recording roughly 2.5% less power (with the power scaling at the default value of 100%) compared to the Assiomas according to compare-the-watts.com
I only realized it when comparing the data sets on the website. While I was riding, I set the Magene up so it showed roughly the same values as the Assiomas and I ended up back at 100%. So I guess I'll be trying 101% next. The power scaling feature has quite an exaggerated effect. Going up and down by one percent changes the readings definitely by more than that, I found. Hopefully, I'll get them to match in the next run. Until the next firmware update rolls out, that is. :)
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3rd run - issue solved.
I did a test run of 55min of free riding on Zwift. I set the Magene P505 to 101%.
The Assiomas and the Magene were within 0.1% of each other according to compare-the-watts.com
The curves are basically indistinguishable from each other. Also the cadence reading is identical.
Very happy with that.
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That's very good news. I'm looking forward to receiving mine...
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I think once i'll match all my unit to my wahoo kickr that I'll never update the firmware again :D
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Sounds very promising. I got the PM for USD 244 on aliexpress, a no brainer (without chainrings).
Being a little weight weenie I’m curious: has anyone thought about using a lighter crankset with the magene spider? I estimate that the standard crankset in total will probably add roughly 60- 100g over my Ultegra crankset :-[
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Sounds very promising. I got the PM for USD 244 on aliexpress, a no brainer (without chainrings).
Being a little weight weenie I’m curious: has anyone thought about using a lighter crankset with the magene spider? I estimate that the standard crankset in total will probably add roughly 60- 100g over my Ultegra crankset :-[
I don't think you can use another crank since the crank-powermeter interface is unique . That's why I ordered the separate powermeter with the 3-bolt interface instead, even if it was the same price.
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I don't think you can use another crank since the crank-powermeter interface is unique . That's why I ordered the separate powermeter with the 3-bolt interface instead, even if it was the same price.
Got it! With what crankset do you paid it?
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Got it! With what crankset do you paid it?
I have ordered a Riro carbon crankset, but it is still in transit.
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I don't think you can use another crank since the crank-powermeter interface is unique . That's why I ordered the separate powermeter with the 3-bolt interface instead, even if it was the same price.
But it is not compatible with a shimano ultegra crank? Or am I on the tube??? It somehow only says something about the chainrings oO
If so which PM would be the right one for an ultegra 12 speed crank?
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But it is not compatible with a shimano ultegra crank? Or am I on the tube??? It somehow only says something about the chainrings oO
If so which PM would be the right one for an ultegra 12 speed crank?
You can't use a spider based PM on shimano road cranks. You will have to get a left crankarm (4iiii or stages or...) with powermeter. Or replace the entire crank...
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You can't use a spider based PM on shimano road cranks. You will have to get a left crankarm (4iiii or stages or...) with powermeter. Or replace the entire crank...
Thank you!
I'd just hate to swap the ultegra lettering for PES :D
I'm curious when the pedals will be released and which cleats they will be compatible with.
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Just got mine set up yeasterday, there's a little play between the chainrings and the spider, but not in the way that it actually matters. The provided spider mount tool didn't quite fit my bb tool, so i had to cover it with a cloth and grab it with pliers to get the leverage to tighten the mount.
Power numbers seen pretty much dead on with my direto xr after using just auto zero. Chainrings seem to shift well so far.
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I received the Riro crankset yesterday. I have not have had the time to put it on the bike or test it. The PM does fit as expected
(https://lh3.googleusercontent.com/pw/ABLVV85_ErafyAb0Yfo9H3saBVo2fVIYgEwSf1KQnafbRcEAIxXNM5PgI-rwIRgX_EPDhCB1q34-QxVU2rZwIUAONktahQrPY3SM8uOJDHm91SCxDccX0deY=w1920-h1080)
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I need a non-Boost fitment for SRAM 3 bolt (0mm offset). What are my options here?
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I need a non-Boost fitment for SRAM 3 bolt (0mm offset). What are my options here?
I have a Sigeyi on my MTB. XCadey is another one.
However they continuously increased their prices these last years, and I often see good deals on Quarq ones.
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...there's a little play between the chainrings and the spider...
This never goes to the better, you should fix that ;)
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I need a non-Boost fitment for SRAM 3 bolt (0mm offset). What are my options here?
I have installed a chairing to mine on the outside and measured the chainline. It is 48- 49mm. Maybe that can help you choose?
I am going to use it in a 1x configuration.
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Did my first ride with the P505 this afternoon. No problems with the PM. I did get some new records for 20min power and power/HR, so I guess I will have to calibrate it against my Zwift Hub to dial down the PM...
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Well, I was wrong. I compared the P505 to the Zwift hub today and it was spot on. Not even a percent difference.
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Well, I was wrong. I compared the P505 to the Zwift hub today and it was spot on. Not even a percent difference.
Doesn't get much better than that! Slightly OT, but what are your thoughts on the crank so far?
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Doesn't get much better than that! Slightly OT, but what are your thoughts on the crank so far?
I have only done about 100km, but the cranks are great so far. The only problem seems to be that the axle is quite short. I could not get it to work at first because the bearings of the BB seized up when tightening the bolt. Swapping the BB68 BB to a shimano BB did the trick. It seems the Shimano BB's use 6mm wide bearings instead of the 7mm wide bearings most Ali BB's use.
Today I installed the second Riro crankset on my commuter bike with no problems. It has an older Shimano MTB BB68 bottom bracket.
Edit: I am talking about my experience with the RIRO carbon crankset and NOT the magene crankset. I bought only the PM and paired it with another crankset
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I've installed my power meter now, I used this bottom bracket: https://www.aliexpress.us/item/2251832835484740.html
and it worked well! The only thing I haven't diagnosed yet is that I have tried to use my Ultegra 11 speed chainrings with the crank, but the spacing between the two chainrings is wide enough that the chain can fall in the middle. I need to take it apart and see if I installed something incorrectly, or maybe the flanges that the chainrings mount to are thicker on the Magene vs. Shimano crank arms?
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I've installed my power meter now, I used this bottom bracket: https://www.aliexpress.us/item/2251832835484740.html
and it worked well! The only thing I haven't diagnosed yet is that I have tried to use my Ultegra 11 speed chainrings with the crank, but the spacing between the two chainrings is wide enough that the chain can fall in the middle. I need to take it apart and see if I installed something incorrectly, or maybe the flanges that the chainrings mount to are thicker on the Magene vs. Shimano crank arms?
Mine were the same thickness (Shimano and Magene). Do you have any calipers you could measure with? Maybe bad QC?
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I got mine with the deckas chainring to replace the Senicx GR3 crank on my gravel bike. Haven't had time with holiday craziness, but should have it installed by next week.
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Mine were the same thickness (Shimano and Magene). Do you have any calipers you could measure with? Maybe bad QC?
Thankfully it was a silly mistake on my part--I didn't realize the small chainring was directional--it has an ever so slight offset one direction. Flipping it around fixed it! Thanks
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so ordered mine today on pandapodium,
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Tested these units and well..
Spot on with my Kickr V5. Really within 1% on al my efforts ranging from 800w tot 20m 281w.
I'm impressed
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One thing I've noticed with mine, set up with a Shimano 105 R7170 Di2 front derailleur, is that the gap between crank arm and outside of the front derailleur at the outer limit is quite tight - for me, looks like less than 1mm on my 2023 Merida Scultura. There's no scratches that would indicate that the two are touching at all - but it's probably something worth noting for those with a similar setup.
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Built it up yesterday, very easy.
It seems to consistently read around 5% lower than my Tacx Neo 2t.
So for the next ride I’ll be trying to adjust the Magenes power scaling and let’s see.
The weight penalty compared to the latest Ultegra 12s was 70g on 170mm cranks and 50/34 for the ww’s.
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Did you auto zero it?
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Did you auto zero it?
Yes, via the magene app and with the cranks being vertical.
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You need to spin them back 5 revs to trigger auto zero
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You need to spin them back 5 revs to trigger auto zero
Isn't it the same outcome?
So far I did some indoor workouts and I'm now within <2% to the Tacx Neo 2t, still trying to optimize the exact powerslope.
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Built it up yesterday, very easy.
It seems to consistently read around 5% lower than my Tacx Neo 2t.
So for the next ride I’ll be trying to adjust the Magenes power scaling and let’s see.
The weight penalty compared to the latest Ultegra 12s was 70g on 170mm cranks and 50/34 for the ww’s.
Update on the accuracy: In short, I'm very happy about it.
After some test runs, average power and normalized power are on average only 0.4-0.6% (!) off from my Tacx Neo 2t wih a 104% power slope setting.
I found that the reason for the larger differences I previously experienced stem from the varying temperature in my workout room. The PM was always correctly zero'd. By having a +- constant room temperature the previous inaccuracies were greatly reduced as I found.
But that's not the full story, there's 2 more things to consider:
1. Eventhough the average power is basically identical to my indoor trainer, the actual power data is not always as close as the average would insinuate.
Actually, the Magene is often surprisingly above or below the tacx ("outliers"). The attached screenshot shows this nicely, where the blue line is the Magene and the purple line the Tacx.
2. The max power, is still off a bit, I think DCRainmaker noted the same thing. In my case it's still 6-7% in difference. Also, the 1s critical power is off by the same percentage, while all other CP value differences are negligible.
All in all a fantastic product and I'm wondering whether I can use it again for my upcoming gravel build. Maybe this time with a lighter 1by crankset as some have done here already.
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All in all a fantastic product and I'm wondering whether I can use it again for my upcoming gravel build. Maybe this time with a lighter 1by crankset as some have done here already.
That will only be possible if you have bought the separate PM and not the PM + crank combo (505 base).
As I have stated before, you can not use that PM with another crank since they use a unique interface.
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That will only be possible if you have bought the separate PM and not the PM + crank combo (505 base).
As I have stated before, you can not use that PM with another crank since they use a unique interface.
Yes that was fully understood, already got the product saved. Thanks again
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That will only be possible if you have bought the separate PM and not the PM + crank combo (505 base).
As I have stated before, you can not use that PM with another crank since they use a unique interface.
Coming back on your builds @TinyDinosaur, does it also work with a 2by crankset, i.e. 2 chainrings?
I suppose they would need to be 3 bolt as well?
My idea was building a 46/30 crankset with the riro cranks.
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Coming back on your builds @TinyDinosaur, does it also work with a 2by crankset, i.e. 2 chainrings?
I suppose they would need to be 3 bolt as well?
My idea was building a 46/30 crankset with the riro cranks.
Yeah, I wouldn't know why that would not work. And indeed 3-bolt chainrings. You could look at the senicx branded ones.
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Yeah, I wouldn't know why that would not work. And indeed 3-bolt chainrings. You could look at the senicx branded ones.
That's very helpful. Is it correct to assume, that in a 3bolt 2by setup with the PM, the chainrings would need to be "one piece"? (as opposed to my experience with original Shimano 2by chainrings).
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That's very helpful. Is it correct to assume, that in a 3bolt 2by setup with the PM, the chainrings would need to be "one piece"? (as opposed to my experience with original Shimano 2by chainrings).
Yes, or you could use a spider adapter, but I guess 1 piece will be more conventient
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Thanks TidyDinosaur. How did you mount the chainring on your Riro crankset and the Magene P505 S1103? Are the 3 bolts of the crankset long enough to go through the holes of both the PM and the chainrings?
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Thanks TidyDinosaur. How did you mount the chainring on your Riro crankset and the Magene P505 S1103? Are the 3 bolts of the crankset long enough to go through the holes of both the PM and the chainrings?
No, it does not work like that. Either you install the 1-piece 3-bolt double chainring (so no PM with that option) OR you install the 3-bolt powermeter and than install normal chainrings to the powermeter.
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No, it does not work like that. Either you install the 1-piece 3-bolt double chainring (so no PM with that option) OR you install the 3-bolt powermeter and than install normal chainrings to the powermeter.
Got it! Would you know whether the small 30-46 chainrings can be really attached to the Magene Powermeter S1103? Seems like due to the small size of the 30t chainring it's not always guaranteed to fit because of the BCD?
Chainrings for reference: https://www.bike-discount.de/en/shimano-grx-fc-rx610-2x12-speed-chainring
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Got it! Would you know whether the small 30-46 chainrings can be really attached to the Magene Powermeter S1103? Seems like due to the small size of the 30t chainring it's not always guaranteed to fit because of the BCD?
Chainrings for reference: https://www.bike-discount.de/en/shimano-grx-fc-rx610-2x12-speed-chainring
No, that won't fit. You need 2 chainrings with bcd 110. I don't know if they exist in a cheap version.
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Got it! Would you know whether the small 30-46 chainrings can be really attached to the Magene Powermeter S1103? Seems like due to the small size of the 30t chainring it's not always guaranteed to fit because of the BCD?
Chainrings for reference: https://www.bike-discount.de/en/shimano-grx-fc-rx610-2x12-speed-chainring
There are 46-32 chainrings from Stone that should fit.
https://de.aliexpress.com/item/1005005163392599.html?gatewayAdapt=glo2deu
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Thanks for all the answers! I was considering the 32-46 as well. In the end, I had the chance to grab some discounted premarket Favero spd PM Pedals for my gravel build and went down that route for a bit more versatility and flexibility. Nonetheless, I think the magene pm here works perfectly for me on my road bike and is of amazing value.
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hi! A nice opportunity appeared for buying the P505 S1078 locally - the 8-bolt 107bcd one
the chainrings I found plenty options on Aliexpress, but I cannot find 8-bolt cranks
you guys have any suggestion or budget options for the cranks?
I'm not looking to upgrade my powermeter (currently I have a Magene P325cs set), but this P505 S1078 is cheap so I'm considering
but if I'll have to buy a sram crank for the 8-bolt, then it ends up being too expensive and not worth it
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only sram make 8-bolt cranks
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Hey guys how do you check pm with your indoor trainer, U use Erg for that? When I put my bike on my wahoo kicker in ERG training mode the magene pm shows around 10-15 watts less then kickr - so I need to put power slope in magene app at 105%. When I use it in normal mode then difference is not that big and power slope is around 102%. This is my first power meter and it is strange to me as all the reviews online say that pes p505 pm crankset is spot on. Any ideas what should I do? I did 5 spin backwards before measuring ofcourse.
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Absolutely not erg mode, just a set, constant resistance
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Absolutely not erg mode, just a set, constant resistance
Thank you my friend
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Absolutely not erg mode, just a set, constant resistance
Why not ERG? I use trainerday programs, so those are blocks of fixed resistance for several minutes. Why would I not be able to use that?
I checked my 4iiii left arm PM against my Zwift hub last week and it also was a little lower compared to the Hub. I set it to 103%.