You need to disable ‘Double the Power’ in the Assioma App.
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Hi @Franz_Vargas, as @S_ticky_KRT mentioned, you should try the settings inside the Assioma app and see whether or not your power is being doubled or not. I can’t remember is this is a separate setting from the setting to let the app know your running UNOs or DUOs, but it should be pretty obvious.
Unfortunately, for me, this did nothing, but hopefully, this will solve your problem. Let us know if figure it out.
John-Paul
Hi John, I have a problem with the Uno pedals on Zwift. My understanding is that the option to double the power in the Assioma app for the Uno’s is not needed on Zwift because they do the doubling. However, this is not the case or should I say not now. Never had a problem with power readings until Saturday just gone. In the starting pen for stage 3 of the MAAP series, never noticed an issue until we set off. I had very little power going out the gate and when I say very little power I mean 0.8w/kg at a sprint. I stopped and restarted but the same problem. I then toggled the double power on within the Assioma app and restarted. This time I was doing 1.9w/kg, still half as much as I normally ride at. Since then I have tested different settings without much joy and now raised a ticket with both Zwift and Favero and sent them files etc. What I have learnt is that with the ‘double power’ toggled off, my power is ridiculously low which would suggest that there is a recent glitch with Zwift which simply does not double the power but just reads the readings from the left leg. I know this is different to your experience but for me, Zwift appears to be having a problem with reading data from some devices.
That is odd, especially that you had “good” numbers for some time and then it just happened out of the blue. Fingers crossed for you that Zwift or Favero have a solution for you.
Ultimately, for me, I gave up using my DUOs with my spin bike. They seem to provide much more accurate numbers on any other bike. Never figured out why, but oh well.
Hi John, just thought I’d let you know that after many emails to and from Zwift, they have finally admitted that there is a problem with Zwift not doubling power from Assioma Uno pedals. Not sure how long a fix will take but at least after many emails making out this was all in my head, they are aware and plan on doing something about it.
Sorry to hear you’ve left Zwift. Maybe after the ‘fix’ you may see a change in your readings on Zwift.
Not so bad I guess. I’ve just replaced it with more outdoor riding, but on those days when you can’t, Zwift sure is nice. Thanks for letting me know. I’ll probably try again some time. All the best.
Hi John.
My friend messaged me and said he had the same problems as you. His pedals was showing correct on his garmin computer on his outdoor bike.
But only half on zwift on a spin bike.
I said, i dont believe that you have the same problems as the guy on the forum
Check your assioma app. Under “compability with other apps”. It should be selected “unified channel” not “Dual channel L/R”
And only pair you left pedal.
He tried that and it worked. He had the wrong option selected.
The garmin computer works differently and will work with dual channel.
What you also could have tried was using zwift when you were on your outdoor bike. I think you would have seen that you got the same result as inside.
Hope you try again as zwift feeling is great.
Thanks, but this is how I have it setup for Zwift.
Ok thats too bad. I guess the only thing left is to use zwift on your mobile phone while you are cycling outside on your normal bike, to prove its not the bike.
I have favero duo since 2 month ago. And its working great on the spinbike at work and on my normal bike. I use the cyclemeter app outside which is Great. You can customize all your screens
Sorry i also was wrong in your case, worth a shot.
Funny, that is the one thing I’ve never thought to do and no one has recommended that. I might do it just because I think I’ve tried everything else. Thanks.
Don’t leave us hanging!
What am I, Flash Gordon? 
:). Yea, after almost a year to the day, I should probably provide an update although it isn’t much really.
I did test on zwift on my mobile device on my bike outside and the result was consistent with what I would see without zwift. Ultimately, there continues to be a ~90 watt difference at the same heart rate when comparing rides outdoors to those inside on a spin bike. It continues to make zero sense to me, but I’ve long decided to just let it go. I’m doing less zwift riding nowadays anyway and keep my Duos on my outdoor bike.
Damn, that’s a shame! I’m planning on doing something very similar myself, so I’m a tad nervous looking through this thread 
The only missing piece are the Duos, which are set to arrive tomorrow. So, we’ll see.
I’m pretty new to cycling in general, so I’m not even sure I’d be able to tell if they’re underreporting or not. From what I gather, I can do an FTP test in Zwift, which I can then compare to some of the power figures thrown around in this thread.
It’d be interesting to test the pedals across a few different indoor bikes, because the whole “negative power” thing doesn’t make much sense to me neither. If you’re exerting yourself the same amount, and the only point of contact between you and the bike is the pedals, surely the power output should be the same? It could only be a fault with the pedals themselves, or a piece of software in-between.
I’ll try and remember to update this thread once I’ve tested them myself. Thanks for responding!
Congratulations on your Duos coming. Even though I’ve had issues, I still can’t blame the pedals. They are consistent, meaning that they are very predictable outdoors and very predictable indoors for me. It just between the two that has been confusing. But if it makes you feel any better, after talking with many others, I am an anomaly for some reason.
The one test I should do that might put all this to rest is to have a fellow cyclist use them on my indoor spin bike and outdoors. It would be sort of asking someone a lot, but I might be able to convince someone to do it. At the same heart rate, the power should be close. If it isn’t then I’ll know it isn’t me. If it is for someone else, then I’ll know it is me for some reason and not the pedals.
Regardless, if you are getting in a good number of rides each week, I bet you’ll be thankful you have them. I’ve successfully used them for plenty of other tests that have turned out well. Also, it is just nice to have some additional data points. I think I would sort of feel like I was missing something now if I didn’t at least have them on fast group rides. For longer rides and recovery rides, I don’t find the data as useful.
This is just my two cents, but I think it will be difficult for you to tell if the pedals are performing accurately based on your FTP test compared to others. That is a pretty wide range out there. There are some things you could do, like stay at a constant heart rate and record via Strava. Strava will give you an estimate of what your power thinks it is. Then you could compare that number with what the power meter pedals provide at the same heart rate. Again, it won’t be perfectly close, but at least give you a ball park.
Also, you can calibrate the Faveros with some weights and something like a string or chain connected to the pedals. It should be in the manual how this is accomplished, but if you really want to know if they are accurate then that is the test Favero would probably recommend.
Ultimately, my recommendation would be to not worry too much about all that and just go ride with them. If you do group rides then you can probably compare with others who have power meters that might be of a similar weight and height. Again, not a perfect science, but it will give you some idea and I’m willing to bet your Duos will come very close to perfectly accurate and precise out of the box.
The other thing I kept in mind even though mine have such a wide discrepancy between outdoor and indoor riding, is what did I really hope to use these for? For me, it was either to improve my cycling or at least have some measure of whether I was backsliding. Mine accomplish that in either setting because the reading are so consistent. So it didn’t really matter all that much that my numbers were lower indoors than out as long as I could compare to my previous rides indoors and out. Hope that makes sense.
Anyway, I do hope you enjoy them, and yes, please let me know what your experience is especially if you have plans to use them indoors and out. I would be curious to know if your numbers are close to the same between the two environments or different. Happy riding!
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First off, thanks for the length reply. I really appreciate it! You’ve put my mind at ease 
You’re completely right, and this is the point that really drives it home. I’m not looking to take my cycling outdoors, at least not until I’m a bit more in-shape. For now, they’ll serve their purpose of providing a benchmark that I can improve against. So long as they’re consistent, I guess accuracy doesn’t matter that much. I’m also not under any illusion that my indoor effort will translate 1-1 with my outdoor effort (once I do decide to venture outside 
).
The pedals came in this morning, and I’ve had a play around with them. My initial impressions are that they’re great. Zwifting without them feels rather pointless, in my eyes - It completely transforms the experience. My first ride, I averaged 120W over 7 miles. Now, it wasn’t maximum effort, and there were a few breaks, but I certainly worked up a sweat. I could ride consistently around 150W for a good length of time. Considering I don’t regularly exercise, and I’m generally unfit, it sounds fairly accurate, at least when compared to some of the figures in this thread. I was also able to get the power output up to above 700W in a different ride. I could only sustain that for about 10 seconds though 
The spin bike I have is a manual, magnetic resistance one (Sunny SF-B1805). So, anytime I wanted more power (i.e. when going up a hill), I had to up the resistance. I can understand the appeal of a smart trainer to do all of this for you, but it’s not a huge deal. Someone compared it to changing gears on a road bike, which is about right.
I’m still getting to grips with all the apps and software side of things. I’m not sure of a better way to share my workout other than to post a picture of Strava
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Looks good. My results aren’t far off from your own. Now, what will be interesting is to see what your power does when you go and ride outside some time. You’ll want to get a good feel between indoors and out on where your power should sit. Again, it doesn’t make any sense in my case, but my power outdoors with an average heart rate of 130 is about 200 watts. Indoors, my power drops to about 125 with an average heart rate of 130. Most everyone else doesn’t see this anomaly and their power is pretty close to the same between the two environments.
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I’ve just purchased a pair of the Favero Assioma Duo Shi to use on my Horizon GR7 which was supplying inconsistent data and dropping out altogether (whole different story). I bought the above pedals with the view of fixing these issues.
First ride completed showed an average power reading of 45 watts, at the resistance I was riding I would expect a far higher reading. Past data from the Horizon GR7 would suggest I should be getting an average power of approx. 120 watts.
I connected my Garmin 920XT at the same time as using Zwift and the data reading was double that of Zwift. The Garmin would be connecting through Ant+ and not Ble. If only my tablet came with Ant+ connectivity!! Just thinking a loud it may be worth getting an Ant+ dongle for the PC and see what the data reads in Zwift using that connection.
Thanks for the suggestion. However, and I recognize it is a long read, if you look through this topic you’ll see that this has sort of been tried. Or at least I remember the Favero engineers asking me to connect to my Garmin 530 via ANT+ while connecting to Zwift via Bluetooth and compare. Unfortunately, the results were the same.
Hi @Nifty280
Welcome to the forum.
I have use the asiomas on ANT+ PC and Bluetooth (PC and Android) and it read about the same as the trainer in all cases.
What are your settings for the asiomas?
You can sort out a lot of these issues by using an open source project I made called SmartSpin2k. It allows you to fractionally adjust the power output of your power meter as well as turning your regular spin bike into a smart trainer by providing ERG mode and full automatic sim mode.