Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Power meter survey

Old 02-04-09, 10:01 AM
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BarryR
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Power meter survey

We’re looking for as many cyclists as possible to complete our online survey of views and opinions on power meters. Even if you don’t have a power meter we want you in the survey. It’s 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/
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Old 02-04-09, 10:42 AM
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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?
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Old 02-04-09, 10:44 AM
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It appears to be a pedal or shoe based system.
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Old 02-04-09, 10:57 AM
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Took the servey. Good luck with your project.
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Old 02-04-09, 11:06 AM
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Originally Posted by Booger View Post
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
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Old 02-04-09, 11:06 AM
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Originally Posted by Treefox View Post
Polar has those chainstay sensor things
and that worked out about as well as the iBike with its air pressure sensor thing
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Old 02-04-09, 11:07 AM
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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).
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Old 02-04-09, 11:28 AM
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Originally Posted by bdcheung View Post
and that worked out about as well as the iBike with its air pressure sensor thing
Careful...your ignorance is showing
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Old 02-04-09, 11:44 AM
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Originally Posted by SpongeDad View Post
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...
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Old 02-04-09, 01:21 PM
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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.
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Old 02-04-09, 01:31 PM
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Originally Posted by tanhalt View Post
Careful...your ignorance is showing
BF meme != ignorance
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Old 02-04-09, 01:44 PM
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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.
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Old 02-04-09, 02:21 PM
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Originally Posted by Booger View Post
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.
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Old 02-04-09, 02:37 PM
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Originally Posted by Psimet2001 View Post
Unicron farts. It's all unicorn farts these days. That and lasers and ball bearings.
Don't you have a fetzer valve to prep?
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Old 02-04-09, 04:17 PM
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Originally Posted by jsharr View Post
Don't you have a fetzer valve to prep?
Indeed. last one was covered with filth and muck.
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Old 02-04-09, 04:42 PM
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I finished the survey earlier, good luck with the project
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Old 02-04-09, 04:50 PM
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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.
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Old 02-04-09, 04:56 PM
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finished survey. please send my power meter.
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Old 02-04-09, 05:55 PM
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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.
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Old 02-04-09, 06:02 PM
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Originally Posted by Brian Ratliff View Post

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...
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Old 02-04-09, 06:08 PM
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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
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Old 02-04-09, 06:25 PM
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Originally Posted by kudude View Post
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.
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Old 02-04-09, 06:32 PM
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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.
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Old 02-23-09, 05:29 AM
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Thanks to all who have completed the power meter survey, and a reminder to those who haven't that it closes next weekend.
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Old 02-23-09, 05:43 AM
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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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