Left/Right-Balance

[al...@soeven.de]

Hi all,

just a short question: I noticed that my left/rigth balance is always >50% sometimes even > 60% does this mean that the left pedal force is bigger than the right one as the name left/right-bal. suggests (or is it the other way around)?

-- Alex

[Jens]

55% is 55% right and 45%left

[Alex Simmons]

What is reported and what is actually happening may differ and depends somewhat on the type of power meter (left and right side means different things to different meters) and on other things that most current power meters don't/can't report. e.g. even if the meters are perfectly accurate, you can be reported as left dominant with one type of meter and right dominant with another.

[Salvatore Taibi]

This was bugging me a bit, so I did a test. Pedaling only with my left foot, the number reads as 80% L/R, then only right foot results in 15%. It's my estimation, therefore, when I'm riding and my normal reading is 47%, it means I'm using my LEFT FOOT 47% of the time, RIGHT FOOT 53%. 

This is with a Quarq Elsa. 

[Alan Weatherall]

Currently there are only 3 power meters on the market that actually measure true left/right power. These are Rotor, Vector and the Look Keo power.

 

What the Quarq does is to split the power value up based on what half of the crank cycle the power was generated in and assign that to one leg or the other. This as you have observe from your results is not the same thing as measuring left write power.

 

Regards

Alan Weatherall

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[Salvatore Taibi]

Alan,

Yes, I did realize the Quarq wasn't truly measuring each individual leg. Interesting how it only shows about 80% of the true value, though. 

FWIW, I had been using the Elsa for about 8 months and I was always around 50/50. Then, almost simultaneously, I updated the Quarq firmware and had a crash during a local crit. For whichever reason, I started noticing a shift from the normal 50/50 to my current 47/53. I emailed Quarq, and they swore it couldn't have been because of the firmware update. This made me wonder if the change was then being caused by my left leg being weak... or perhaps too strong and providing a boost for the right during it's half of the cycle. 

Anyway, I just wanted to clear up for the OP that the number GC is giving represents LEFT LEG percentage. 

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