This link works better: http://power.rotorbike.com/ and http://inpower.rotorbike.com/

Is it me or does there seem to be quite a disparity between EU and U.S. pricing?

Yep, looks like they are using an old exchange rate.

Bike Rumor has also published an article: All New Rotor Inpower Hides Power Meter Inside Crank Spindle

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¯\_(ツ)_/¯

Looks nice, but can't put it on my BB90 Boone, so none for me.

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Any run that doesn't include pooping in someone's front yard is a win.

Looks really interesting. One of these days I'll make a decision...

Is it just left leg power?

Since your right leg doesn't apply any significant torque to the spindle, it can only measure left leg power.

I see. Thanks Andrew! So unless the PM offers true L/R measurement, it's either spindle or spider for crank based PMs. Perhaps I'll just grab a used Powertap and bypass all of that. :)

I'm not 100% clear on what you mean by the above, but...

To measure total power with a crank-based powermeter requires instrumenting either both sides (e.g., the original Rotor powermeter, Verve), or the spider (e.g., SRM, Quarq). If you instrument only the left side (e.g., Stages, Rotor LT) or the spindle (axle) (e.g., Ergomo, new Rotor), power supplied by the right leg isn't sensed, as it is transmitted directly to the drivetrain.

ETA: I don't recall seeing these sentences in the original article (although it is quite possible that I missed them):

"It can only measure from the left because the force coming from the left crankarm being pedaled has to travel through the spindle to get to the spider. On the driveside, your power is going directly to the spider, which is why so many crank based power meters measure power there. Those measure aggregate power without left or right information. Here, it’s doubling the left side’s number to give you total power."

What's really confusing, though, is the shot of the head unit showing pedal smoothness for both the left and right legs, which isn't possible. Perhaps the fact that the crank being tested was a prototype means that data were being misreported via the ANT+ protocol, thus accounting for this error as well as the fact that torque effectiveness wasn't reported (BTW, contrary to the article neither of those metrics are new, being developed/introduced in response to release of the original Rotor powermeter.)

Last comment: my right leg is particularly "smooth", but even it never reaches 35% (of course, there's also no evidence that maximizing "smoothness" improves performance/function in any way...in fact, all of the data point in the opposite direction).

There is a dual power version with sensors on both sides.

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Tiago
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Sponsors: : Blueseventy :

That's the original Rotor powermeter (that I tested for ~1 y) - see the answer to the 1st question of their FAQ found here:

http://inpower.rotorbike.com/faqs/?lang=en

Hm.. Your last point. Have you seen that pedal smoothness decreases when a rider becomes more fit, or just that very fit riders tend to have a lower smoothness?

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Endurance coach | Physiotherapist (primary care) | Bikefitter | Swede

Pedal smoothness tends to increase with increasing power output, so I'd favor the latter explanation.

Certainly, my pedal smoothness hasn't really changed over the last ~1 y, despite my FTP dropping by >100 W (due to ~4 mo of zero training due to a crash) then increasing again by ~50 W.

BTW, note that for those who have true dual-sided powermeters, WKO4 will include new metrics designed to provide better insight into a rider's pedaling "style".

ETA: I posted some graphs of my own balance, torque effectiveness, and pedal smoothness as a function of power and cadence on the TRWPM FB page back in early December of 2013 if anyone's interested.

Is it me using my smartphone? Where is the price?

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"In the world I see you are stalking elk through the damp canyon forests around the ruins of Rockefeller Center. You'll wear leather clothes that will last you the rest of your life. You'll climb the wrist-thick kudzu vines that wrap the Sears Towers. And when you look down, you'll see tiny figures pounding corn, laying stripes of venison on the empty car pool lane of some abandoned superhighway." T Durden

I use the powermeter market as an example for my economics classes. The evolution from SRM ($$$$) to the current models available with all the different price points......almost perfect textbook example of a competitive market. I just treat all the PM's as prefect substitutes which would cause Andrew to cringe. :)

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The curious task of economics is to demonstrate to men how little they really know about what they imagine they can design.

hmmm, its seems to have sparked a bit of a price drop for vectors :D


edit

ah, I see why now

http://www.dcrainmaker.com/...ctor2-announced.html

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http://www.thetrinerd.com

*shudder*

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

Is it a class in Keynesian economics?

Nobody teaches Keynesian anymore. Krugman is the last man standing in that camp. lol.

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The curious task of economics is to demonstrate to men how little they really know about what they imagine they can design.

Didn't Bernanke just give us a good lesson in Keynesian Economics ?

Keynesian economics as most people know it doesn't exist anymore. The model is currently evolving to accommodate the failures of the model during the recession. It's now referred to as the new Keynesian model.economics understand there is no one model that fixes everything and anything.

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The curious task of economics is to demonstrate to men how little they really know about what they imagine they can design.

Economics is not science since it cannot predict anything.
It is Monday morning quarterbacking with fancy graphs.