Thoughts on best power meter

linklemming

Well-Known Member
Well, if I had to, I would immediately buy a HR armband and set my Vado to "assist me to keep me at given HR". It seems more practical. (I'm finding it difficult to watch the bike display or the smartphone for the whole time during the ride, as observing the road in front of me is more essential). The reason I'm not buying the Polar armband is I don't want to be totally "robotised" by the e-bike ;)
Your just being silly here Stefan. Have I or any other person in this thread talked about 'continuously monitoring a display to the point of ignoring the road'.

If you really want to get technical about it, the CA doesnt allow human power to be displayed on the main screen. I also have the screens setup so that after a few seconds, any screen I changed to will default back to the main screen so what you seem to be implying isnt even possible with my setup.

In reality, I use the average human power to 'spot check' during a ride. I record this in garmin connect along with heart rate data (recorded automatically). If garmin would provide an average heartrate during the ride like it does post ride I would use that as well.
 

Stefan Mikes

Well-Known Member
Region
Europe
City
Brwinów (PL)
If you really want to get technical about it, the CA doesnt allow human power to be displayed on the main screen. I also have the screens setup so that after a few seconds, any screen I changed to will default back to the main screen so what you seem to be implying isnt even possible with my setup.

In reality, I use the average human power to 'spot check' during a ride. I record this in garmin connect along with heart rate data (recorded automatically). If garmin would provide an average heartrate during the ride like it does post ride I would use that as well.
I don't need to make all those considerations:
1608672603404.png

A small subsection of BLEvo post-ride report for Specialized Turbo e-bikes. "Motor power" here is in fact "power consumed from the battery". Multiply by efficiency of 0.75.
 

Johnny

Well-Known Member
I just finished swapping my Vector pedals onto my Stromer this morning, and I'll try to get out for a test ride at lunch. I also appreciate the additional info on CA.

I was wondering if you can use your Vector pedals with a clipless to flat adapter. I want to avoid changing the crank, pedal power meters are convenient however I don't want to wear clipless shoes all the time.
 

tbar23

Member
@Johnny this may be possible, but most of the clipless to flat adapters I have seen are Shimano SPD to flat. The Garmin Vector pedals are LOOK cleat compatible, and I think most of the other pedal-based power meters use some kind of “road” pedal cleat. This thread https://bicycles.stackexchange.com/...dal-based-power-meters-be-used-as-flat-pedals
doesn’t read very promising on this idea.

Another update on my end - I tried to get the Quarq Dub Dzero power meter to work with my Stromer, but the required crank arms are a bit unusual. You need an english threaded compatible BB (easy to find) with 73 mm shell (typical of MTBs). Then you need a “road wide” crank arm set.
I found it quite difficult to get everything right and eventual gave up - returning everything.
 

Johnny

Well-Known Member
@Johnny this may be possible, but most of the clipless to flat adapters I have seen are Shimano SPD to flat. The Garmin Vector pedals are LOOK cleat compatible, and I think most of the other pedal-based power meters use some kind of “road” pedal cleat. This thread https://bicycles.stackexchange.com/...dal-based-power-meters-be-used-as-flat-pedals
doesn’t read very promising on this idea.

Another update on my end - I tried to get the Quarq Dub Dzero power meter to work with my Stromer, but the required crank arms are a bit unusual. You need an english threaded compatible BB (easy to find) with 73 mm shell (typical of MTBs). Then you need a “road wide” crank arm set.
I found it quite difficult to get everything right and eventual gave up - returning everything.

Yeah I read that one too.

The problem is it is an FSA set and it is hard to find FSA compatible stages or similar crank arm power meter.
I also don't want to change the whole crankset.
Have you by any chance found a compatible left crank arm based power meter?

Moreover pedal based power meters are easy to move in between different bikes. I am looking at assioma favero and it should take flat pedal adapters yet I am not certain because of the large cylindrical power meter tip.
 

Ebiker01

Well-Known Member
I would like to know how much power I am generating vs the bike.
i will tell you w/o a PM what numbers you will get.

On flats you are putting 0-175watts avg. for longer then 15min., and ocasionally 175-300watts for less then 1min.

On hills or incline it will show that you have higher wattage b/c weight is a bigger factor on inclines resulting in higher wattage.

If u do really have the urge to get a PM , with about 2-3% accuracy for 150$ from Germany , Sigma ROX 11 delivers !!
At 0.5-2% accuracy a PM will cost hundreds of thousands of $ and will show you the same thing that basically you suck ....meaning avg . normalized power 89 watts or less for that 2hour ride...


Stay away from Strava and enjoy the ride 🚵
 

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Johnny

Well-Known Member
i will tell you w/o a PM what numbers you will get.

On flats you are putting 0-175watts avg. for longer then 15min., and ocasionally 175-300watts for less then 1min.

On hills or incline it will show that you have higher wattage b/c weight is a bigger factor on inclines resulting in higher wattage.

If u do really have the urge to get a PM , with about 2-3% accuracy for 150$ from Germany , Sigma ROX 11 delivers !!
At 0.5-2% accuracy a PM will cost hundreds of thousands of $ and will show you the same thing that basically you suck ....meaning avg . normalized power 89 watts or less for that 2hour ride...


Stay away from Strava and enjoy the ride 🚵

That looks like a nice device but it says calculated so is it just some estimate or does it actually measure the rider input (with a crank/pedal/bracket etc sensor)? If it is just calculating then how is it differentiating rider power from the motor power?

You are right that it is harder to reach higher power outputs if using assistance on flats. However If I am riding for fitness I usually turn the bike off on flats and as you can see when the lane is open I can keep quite a bit over 175w. Bosch's power data may not be as accurate as stand alone power meters but as long as you keep a sustained effort it is nice.


mypower1.PNG
 

Stefan Mikes

Well-Known Member
Region
Europe
City
Brwinów (PL)
Specialized Turbo e-bikes measure rider's and motor power independently and even let analyse the data post-ride.

1613991420120.png

Rider's power filtered to be >20 W for better chart clarity.
 

Ebiker01

Well-Known Member
The Rox 10 has it's own software algorithm based on wind resistance (wind sensor is placed at the top front of the device) , rider /bike weight, tire info and a few others variables that i don't recall right now.
It shows temp., 5sec. power,30sec. , avg., max. ,etc . A lot of different screens and easy to use.

But i'm not sure if it can differentiate between us and the machine
.
The Rox 12 can ! https://www.sigmasport.com/en/produkte/fahrrad-computer/gps/rox/rox-12-0?submenu=features

It's really good , unless you put high numbers where 1.5% or less accuracy would make a difference in the chart .
Ex. : a 400watts hill effort could be 395 or 405 watts.
And also it's very light -60,70grams 😉
does it actually measure the rider input
 
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Ebiker01

Well-Known Member
The latest Sigma powermeter -Rox 12 beats Garmin and is a lot less @400$ vs 700$ for Garmin.


 

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Handlebars

Well-Known Member
Region
Canada
I noticed the other day that the muscles on my left thigh are becoming more developed than on my right, whereas with my acoustic bikes in other times both legs looked the same. Becoming conscious of that, I began using my right leg with more power and it then became physically noticeable to me that I had been using my left more, for power. It would be neat to be able track torque from each leg separately. I may have begun favoring the right in order to avoid getting chain dirt on pants or because I hear the pant leg rubbing against the chainring guard. No matter - power output differences could also be a sign of something else, something more important.
 
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Johnny

Well-Known Member
But i'm not sure if it can differentiate between us and the machine

Looks like a nice cycle computer. I am aware of the wind sensors and they look nice. Unfortunately as you have mentioned, those sensor seem to be measuring the whole output (bike + rider).
 

tbar23

Member
Yeah I read that one too.

The problem is it is an FSA set and it is hard to find FSA compatible stages or similar crank arm power meter.
I also don't want to change the whole crankset.
Have you by any chance found a compatible left crank arm based power meter?

Moreover pedal based power meters are easy to move in between different bikes. I am looking at assioma favero and it should take flat pedal adapters yet I am not certain because of the large cylindrical power meter tip.
No go on Stages crank arm PM.
No go on 4iiii.
Maybe you are right on pedals being the best option.
 

Captain Slow

Well-Known Member
I ride a Creo and I have a Garmin computer. While the Creo will show the power I generate and the power the motor is supplying if I use the Specialized app, it doesn't record the motor power. My Garmin will record the power I generate but not the power the motor generates. It would be really interesting to see both data sources but I don't know how to record both.

I might try out the BLevo app this year as I know others on here really like it.