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Rotor Adds Second Single-Sided Power Meter Crankset, Makes it Right

Written by Tyler Benedict
8 Comments
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rotor power lt-r right sided single-arm power meter crankset

This summer, Rotor introduced their Power LT (as in “power light”) single sided crankarm power meter placed on the non-drive side. It is essentially the same apparatus used on the full, two-sided Rotor Power crankset, except that it calculates total power output from a single side by doubling the number and sending that to your cycling computer.

Apparently, some pros and sponsored teams wanted it to be on drive side, where the chainrings could protect the battery/transmitter protrusion from damage (think barrier bunny hops, errant tree stumps, etc.). It’s built on their 3D+ hollow machined alloy crank arms and keeps all the high resolution data transfer of the original. Things like torque effectiveness, pedal smoothness and total power are all provided, just averaged to give a total number from one arm, er, leg. Available now in 130BCD and 110BCD (shown after the break), and the left sided LT model will remain in the line, too.

rotor-power-lt-r-driveside-single-side-powermeter-crankset2

Retail is $1,490 / €990.

RotorBike.com
Tyler Benedict
11,282 articles

Tyler Benedict is the Founder of Bikerumor.com, where he’s been writing about the latest bikes, components, and cycling technology for almost two decades. Prior to that, Tyler launched and built multiple sports nutrition brands and consumer goods companies, mostly as an excuse to travel and ride in new places.

Based in North Carolina, Tyler also loves the Vanlife & family adventure travel and is always on the lookout for the next shiny new part and off-grid adventure.

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Alex
Alex
10 years ago

The article isn’t clear on this so I’m a little confused. Is the drive side version now measuring one leg power only or is it measuring both leg power like the Quarq and SRM?

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RED
RED
10 years ago

There are three options:

1) non-LT model, which measures power on BOTH sides.

or

LT models, which measure power on only ONE side.
There are two LT units to choose from right now….

2) The original LT model which measures on the non-drive side
3) The new LT model which measures on the drive side

BikeRumor has pictured both LT models above:
At the top is the new LT with measurement on the DS
At the bottom is the old LT with measurement on the NDS

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Derek
Derek
10 years ago

@Alex The powermeter is in the arm, not the spider, so it is only one (right) leg power.

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Tyler Benedict
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Tyler Benedict
10 years ago

@Alex – Derek’s correct, it only measures one leg’s power, then doubles that number to provide total power output. That’s how any single-sided device works, like Stages for example. For those that don’t need the exact power balance from each leg and just want basic power info to gauge their progress or training effort, it’s a much less expensive option that’s accurate enough.

@RED – Those are the pics Rotor had available, not sure if they’ll do distinct etching to add the “-R” on the right-side only versions.

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alvis
alvis
10 years ago

@Alex to be clear SRM and Quarq only measure one side and guestimate balance. True bilateral power is available from Garmin, Factor, Rotor (the proper one not the toy LT version) and the new Infocrank. By all early accounts Infocrank nails accuracy as well, it was developed from a device the AIS use to maintain the calibration of their SRMs. The AUS are repeating a proper scientific (Rainmaker take note!) study of the state of the art power meters. Will make interesting reading when its published…..

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Dave
Dave
10 years ago

@alvis, that is incorrect. SRM, Quarq, and any others that measure at the spider are measuring the TOTAL force (torque) of both legs combined. Perhaps you meant to state that they don’t measure left/right power independently?

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Yancey
Yancey
10 years ago

@Alvis, just to be clear for those less knowledgeable. SRM and Quarq measure total (R+L) power and estimate the power balance from the torque pulses.

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Psi Squared
Psi Squared
10 years ago

The problem with the Rotor LT units is that you could get something like a PowerTap, a Power2max power meter, or very nearly something from Quarq. Those units actually measure power from both legs. It’s tough to see what would be the benefit to a Rotor LT over something, for example, like one of Power2max’s Rotor offerings.

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