Left / Right Power in TR Performance Analytics?



I know TR is gathering further ANT+ data into the app like battery life. Any chance you can enable L/R power for those using dual side power meters?

I get the majority of the customers are using smart trainers, and most PM’s are single sided, but there is no better situation to analyse power balance than a trainer session. Especially when the variables can be highly controlled, like doing the same workout and seeing the balance varies. For most road cyclists it might not be that important, but receiving lots of bumps and knocks in CX/MTB races I definitely see big changes in L/R from the injury/soreness to fully recovered.

And before anyone says it, yes, I know I can run the Garmin headunit, but I want the historical data. Worst case TR, can you just send the data on so the upstream API data programs can analyse it? Your app is awesome, would prefer to see it there, and bonus if it was available on screen. :slight_smile:


I would love to see a live 60 second rolling average of my L/R balance while training on the app. Although that is probably a pretty niche feature relatively speaking.


Very niche, but I know the TR guys are fans of PM’s and power based pedals. The data is there for the taking. Again, even if TR doesn’t present it, can you record it anyway? So at least, dare I say it, TrainingPeaks can tell me? DISCLAIMER I am a financial supporter of TrainerRoad, but I still import my data into the free tier of Training Peaks for the L/R balance assessment.

As TR becomes more than just indoor training (Analytics/Calendar) this data is more and more critical. And again, it’s there for the taking, it’s Ant+.


L/R power balance information can also useful in the context of recovering from injury. That’s my primary use of it and the main reason why I bought a dual sided power meter.


We could record it and send it up. I don’t feel like it’s a useful metric. I do hear about using it for injury recovery…but I don’t know how you do that.

We’ve got higher priority (in our opinion) features to do so this one might be pushed out for a long while.


Thanks @Nate, definitely get it’s not a priority for the majority doing the TR workouts. But TR analytics / calendar is now focused on outdoor rides too, so having that data in the analytics page would be ace. At least pass it along for now so those of us who have dual PMs can see it elsewhere when it’s the TR app that is recording our rides.


@Nate I like it bc it helps me review my pedal stroke. I’m normally within 1-2% but some outdoor rides I get sloppy and it shows. I’d be curious to know how I do in the training environment as well.


I don’t think it matters.

I just had a conversation about this with a higher up of a BIG power meter company. They said that the research isn’t conclusive. They think that it might actually be beneficial to not be 50/50. There might be evidence that the leg that is doing less work kinda has a reserve that kicks in when you really accelerate, kinda like a booster.

I think it’s more important to just focus on the basics. FTP increase, skills, nutrition, recovery, then hone the knife for the type of riding you’re going to do. Maybe throw in equipment after that.

That’s my opinion at least :slight_smile:.


I don’t expect to be 50/50, but I have a baseline that I like to see. It’s another data point to tie to good days, bad days, high/low intensity, etc.


I broke my pelvis little over 2 years ago. Being 70 now it has taken awhile to recover.

I used balance on power meter to gradually increase power back to my right side. Continued using after I had some 50/50 sessions. Then noticed I was starting to over compensate with right leg. It did help I think seeing what was happening. Since Spring I have not paid much attention to balance, but I think it helped me in getting back to normal.

I know at one time some were saying that getting balance in leg strength was the easiest way to increase power. I am not sure that is correct, because in the real world there are too many variables to deal with and power is power.


I injured my SI joint in my left hip a year or so ago. My right quad was killing me in base training last year. Wondering if my injured left leg could be lazy I tried powertap pedals. Low and behold my left leg was slumming. I started concentrating on using left leg muscles more and as power differential left to right improved with concentrated effort my right quad stopped getting pumped up and tired.

That said though I have funky thing going on probably like Nate said one leg kicking in as booster. My left leg tends to be lazy and lower power at endurance efforts (L2) but when going hard like ftp tests my left leg is often like 5% higher power output than left - guess my left is a booster. :slight_smile:

Even now if my right leg gets hurting or overworked feeling I concentrate on trying to work my left leg a little harder and my right leg starts felling normal again.


After some MTB injuries I was consistently at 60/40, I could tell something was wrong after a few months with the Osteo I was back very close to averaging 50/50. I do realize that this is niche data, but it’s every helpful if you suspect something is not right.


Here’s the question: without the left right data would you still have come back to 50/50ish?

I’m thinking yes.


Sure, but it’s also dropped off when I stopped seeing the Osteo (and stopped doing the prescribed stretches). Also, balance went way off after a big MTB crash, so I use the balance a metric now that keeps my pedaling even and is a good indicator of being recovered after an injury. I guess we can argue the value of L/R or the lack of value, but in the end, all I’m asking for is that it get passed along from the TR app to the sites that I sync with. :slight_smile:


Even if there is not a lot of conclusive evidence about what to do with the information yet, as someone who’s just started a program, I’d like to see if there is any progress in improving my pedaling technique given all the single-leg and quadrant drills which are part of the workouts. I’d at least like to see it in Garmin Connect even if you’re not interested in showing it for the moment.

I do agree with previous posters that seeing it live during quadrant and single-leg drills would be beneficial. From my own experience, I’ve seen that I’m nearly 50/50 during lower power efforts, but that the difference skews to 55/45 in higher efforts. When I entered the results into the Training Peaks WKO analysis tool, it seemed like my right leg was absorbing/negating some of the left leg power, likely by not unweighting enough. I think that would be useful to correct. On a side note (or study proposal), as a triathlete I’d like to see if there’s a difference in run performance of someone who is 50/50 vs an imbalanced.