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-   -   Power meter survey (https://www.bikeforums.net/road-cycling/508263-power-meter-survey.html)

BarryR 02-04-09 10:01 AM

Power meter survey
 
Weíre looking for as many cyclists as possible to complete our online survey of views and opinions on power meters. Even if you donít have a power meter we want you in the survey. Itís open to all cyclists, of any persuasion and any level, and everyone who completes the survey can enter a draw to win a pair of Detec carbon wheels. The survey runs until 1st March 2009. See www.brimbrothers.com/survey/

Booger 02-04-09 10:42 AM

Are you going to tell us about the power meter in the works? If it's not crank or hub based, how does it measure power?

Bluechip 02-04-09 10:44 AM

It appears to be a pedal or shoe based system.

bdcheung 02-04-09 10:57 AM

Took the servey. Good luck with your project.

Treefox 02-04-09 11:06 AM


Originally Posted by Booger (Post 8303760)
Are you going to tell us about the power meter in the works? If it's not crank or hub based, how does it measure power?

Polar has those chainstay sensor things

bdcheung 02-04-09 11:06 AM


Originally Posted by Treefox (Post 8303911)
Polar has those chainstay sensor things

and that worked out about as well as the iBike with its air pressure sensor thing

SpongeDad 02-04-09 11:07 AM

Apparently it will use "piezoceramic components" from very summary web descriptions. It is also referred to as a direct force measuring device.

I took the survey, but here's my take home advice:

1 - $1200, wireless, same weight and accuracy as Powertap or Quarq and it doesn't mess with the fit of my shoes - I and many others will buy one.

2 - Your life will be happier if you beat any Quarq release of a Shimano compatible device (not that any is schedule).

Hell, I'd buy one even if I had to go up a size (as long as the shoes still fit well).

tanhalt 02-04-09 11:28 AM


Originally Posted by bdcheung (Post 8303914)
and that worked out about as well as the iBike with its air pressure sensor thing

Careful...your ignorance is showing :rolleyes:

tanhalt 02-04-09 11:44 AM


Originally Posted by SpongeDad (Post 8303915)
Apparently it will use "piezoceramic components" from very summary web descriptions. It is also referred to as a direct force measuring device.

I took the survey, but here's my take home advice:

1 - $1200, wireless, same weight and accuracy as Powertap or Quarq and it doesn't mess with the fit of my shoes - I and many others will buy one.

2 - Your life will be happier if you beat any Quarq release of a Shimano compatible device (not that any is schedule).

Hell, I'd buy one even if I had to go up a size (as long as the shoes still fit well).


Hmmm...if the idea is to have some sort of force measuring device in the shoe, I have a hard time seeing how they will be able to get accurate power measurements across the board without also measuring the shoe/crank angle in order to calculate the effective driving force...that was a MAJOR assumption for the Microsports idea...

CastIron 02-04-09 01:21 PM

I don't see a viable foot/shoe/pedal option:

1) I really like the fit/performance of my shoes/insoles/cleats/shims/pedals and am loathe to screw with it.

2) I don't see Speedplay (and others) offering up their bits for extensive modification.

3) Threading it in between the pedal/crank interface would really add to the Q-factor.

bdcheung 02-04-09 01:31 PM


Originally Posted by tanhalt (Post 8304040)
Careful...your ignorance is showing :rolleyes:

BF meme != ignorance :thumb:

Flatballer 02-04-09 01:44 PM

Those wheels are MINE! They don't even say how much they weigh in the link. They look pretty heavy, considering the depth and price.

Survey taken though. Good luck.

If you can undercut Quarq, be accurate, and not have me making huge equipment changes to use it, you'll do well.

Psimet2001 02-04-09 02:21 PM


Originally Posted by Booger (Post 8303760)
Are you going to tell us about the power meter in the works? If it's not crank or hub based, how does it measure power?

Unicron farts. It's all unicorn farts these days. That and lasers and ball bearings.

jsharr 02-04-09 02:37 PM


Originally Posted by Psimet2001 (Post 8305099)
Unicron farts. It's all unicorn farts these days. That and lasers and ball bearings.

Don't you have a fetzer valve to prep?

Psimet2001 02-04-09 04:17 PM


Originally Posted by jsharr (Post 8305223)
Don't you have a fetzer valve to prep?

Indeed. last one was covered with filth and muck.

irish pat 02-04-09 04:42 PM

I finished the survey earlier, good luck with the project:thumb:

kudude 02-04-09 04:50 PM

I took the survey. Good luck. I for one don't care at all how hard it is to install, just that it's relatively cheap (haha), accurate and is easy to calibrate. I had some issues w/ an SRM that had slope drift and would like to easily check that my numbers are meaningful.

dmb2786 02-04-09 04:56 PM

finished survey. please send my power meter.

Brian Ratliff 02-04-09 05:55 PM

I doubt it's the shoe - it would seem to me that there are too many interface issues, not to mention the wear and tear that goes on at the bottom of your shoe. Maybe a piezoelectric load cell that fits between the crank arm and the the pedal.

Where else are you going to put it? Crank spider has been done twice. There's one for the bottom bracket. One at the hub. One that measures chain tension. And then there's the measure-everything-else-to-derive-the-power iBike unit.

The only thing left is the pedals.

tanhalt 02-04-09 06:02 PM


Originally Posted by Brian Ratliff (Post 8306515)

The only thing left is the pedals.

Not really...I like the idea of putting piezos fore-aft between the driveside BB bearings and the frame and just measuring the reaction force from the chain tension...

Then again, Shimano has had a patent on that idea for quite awhile now...;)

kudude 02-04-09 06:08 PM

just because it's been done, doesn't mean it can't be done better/cheaper. Also ergomo doesn't exist anymore, so BB is REALLY back in play

tanhalt 02-04-09 06:25 PM


Originally Posted by kudude (Post 8306570)
just because it's been done, doesn't mean it can't be done better/cheaper. Also ergomo doesn't exist anymore, so BB is REALLY back in play

Just remember that the MAJOR "Achille's heel" of using "twist" in the BB as a torque measurement is that you only get the output from the left leg.

Bob Dopolina 02-04-09 06:32 PM

I know Ciclosport was working on a shoe/pedal based power meter but that company is in such a state of disarray that I doubt it will ever happen.

I like the idea, though.

BarryR 02-23-09 05:29 AM

Thanks to all who have completed the power meter survey, and a reminder to those who haven't that it closes next weekend.

Homebrew01 02-23-09 05:43 AM

If it's shoe or pedal based it will have to read power in all directions so that it measures the upstroke too.


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