Tuesday, February 19, 2013

Rotor Power Meter - Feedback

We've been testing out the New Rotor Power meter for a couple weeks now and have great news to report.
Rotor Power Meter with 55/42 Aero Q-rings

Our rider, Matt Mangen, is a professional triathlete focusing on Xterra, non-drafting Olympic, and some 70.3 racing.  

The unit he's riding is a 172.5mm, 130 BCD, Rotor Power Meter which is based on a Rotor 3D+ crank.  This particular unit is an Aero/TT Spider calibrated for 55/42 Aero Q-rings.  Using the MAS (Micro-adjust system), we set Matt's up with a Q-ring OCP (Optimal Chainring Position) of 4.5 on the 55-tooth and 3.5 on the 42-tooth ring.  (5 is the maximum and 1 is the minimum.  #5 means the largest effective gearing occurs closer to ~five-o-clock, while #1 occurs closer to four-o-clock)

The most intriguing feature we were looking forward to testing out, is independent Power measurement.  In the Rotor Power meter, there are actually TWO power meters, one for the left crank arm and one for the right crank arm.  This is the only way to get TRUE independent measurement in order to see what the left and right leg are doing individually.

Others, such as newer Quarq models, give a Power Balance that uses some assumptions.  For example, L power is the sum of what the L leg is pushing down and the what the R leg is "pulling up".  Thus, you could "trick" the power meter into thinking you are pushing down with the L leg if you were doing a R, single-leg drill where you are pulling up hard with the R leg.  

Because there are 2 power meters aboard, the Rotor Power Meter does not require the use of a mounted drive-side magnet.  Just install like any other crank and go!

Matt's Argon 18 E-116 equipped with Rotor Power Meter
The numbers that flash are super-steady (that is, of course, if you are putting out a truly steady effort), and are based on several HUNDRED (500 to be exact) measurements per second, thus giving a TRUE reading of what you are doing throughout the pedal stroke.  

If you are an experienced SRM user, you will appreciate the steadiness of the Rotor Power meter numbers that flash, as well as the consistency of the unit on the whole.  

In my (Kirk's) personal experience, PowerTap is the "bounciest", Quarq second, followed by SRM and Rotor Power in a tie.

Overall, we are more than impressed with the new Rotor Power Meter -- 
Great looks
functions simply and as it should
easy installation
easy user-battery replacement (simple screw cap)
performance (several HUNDRED measurements taken per second)
increased data features including true independent power numbers


Bottom line, the new Rotor Power Meter is everything we've come to expect from Rotor Bike Components -- style, performance, and function.  

Let us know if you have any questions or if you are interested in purchasing.

info@dh313.com

2 comments:

  1. Kirk, had any issues with intermittent cadence (and power) drops? Especially outdoors on less than perfect roads where there is a bit of vibration?

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  2. Hi RoadRunner,
    Actually, yes we have seen some data drops. I've been riding Power2Max recently, so it's been a few months since I've been on the Rotor Power. I have a client that has seen some drops for up to 1 minute. He said it occurs perhaps once every 2-3 rides. Not sure if it's something that can be remedied with a future firmware update or not.

    thanks for your question.
    Kirk

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