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Quarq Elsa RS Power Meter Crank Arms - GXP

Sale $1,189.15 $1,399.00 15% off

Item # QRQ000B

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  • Black, 175mm ($1,189.15)
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Item # QRQ000B

Take measures.

Anyone who has ever trained or raced with the benefit of a power meter knows how irreplaceable those metrics can be. Anyone who hasn't is probably keenly aware of a difference between themselves and certain other members of their local scene. Chances are good that if you're at the top, then you've got something like the Quarq Elsa RS Power Meter Crank Arms between you and the road. If you're at the bottom, then the Elsa RS's five strain gauges — and their industry-leading accuracy of 1.5% — are your chance to take measures to address that.

The Elsa RS GXP is a study in compatibilities. The first two are limiting: It only supports Shimano four-arm Hollowglide chainrings and only mounts into a GXP bottom bracket. Its other compatibilities are less restrictive, though. Since it communicates to your head unit via ANT+ wireless, your current computer is likely already compatible with it. The Elsa RS also features Quarq's OmniCal power measurement technology, which makes the unit's measurement and accuracy independent of the chainrings so you can swap Hollowgram ring sizes — or even GXP-equipped bikes — without worrying about compatibility.

The proprietary Power Balance technology provides a degree of customizability in your training rather than in the equipment itself. Power Balance measures and displays the power you're generating in both crank arms separately, so you can compare the two and identify weaknesses in either leg to target for improvement. The Elsa also excels in usability, as evidenced by the ability to change the system battery yourself. Other systems require you to mail in your crankset for battery swap-outs, but the Elsa RS features a tool-free user replacement system as well as a predicted 300+ hours of ride time per battery. This means more time in the saddle and no need for backup cranksets.

One issue that has plagued power meters since their inception is wildly variable temperatures at events like Tahoe, where rapidly rising or falling mercury necessitates one or more mid-event zeroings. Even if it's just coasting for a few seconds or toggling through your head unit to the proper option, it can still be the difference between winning and losing. It's also a pain. The Elsa RS addresses this with a dynamic temperature compensation that includes over 10,000 data points. The gist of this is that it figures out the atmospheric details for you with minimal drift, so you can focus on turning the cranks, not babysitting them.

The Quarq Elsa RS unit is waterproof for 30 minutes while submerged under one meter of water, just in case you want to take your bike on the swim leg, too. It also measures cadence with an AxCad accelerometer, and it can help you track this and other metrics with various training software such as Training Peaks WKO+, Training Peaks, Golden Cheetah, and Strava. Please note that as of January, 2015, the Elsa RS isn't compatible with Trek Boone Disc Frame.

  • Compatible with Shimano road Hollowglide chainrings and GXP bottom brackets
  • Five strain gauges for +/-1.5% accuracy
  • Waterproof at 1M depth for 30 minutes
  • Communicates to head units via the ANT+ protocol
  • Supports Training Peaks WKO+, Training Peaks, Golden Cheetah, and Strava

Tech Specs

Arm Material:
Exogram Hollow Carbon
Arm Length:
170 mm, 172.5 mm, 175 mm
Bolt Circle Diameter:
110 mm
Bottom Bracket:
BB Threading:
Compatible Components:
Shimano Hollowglide 11-speed chainrings
Claimed Weight:
[172.5mm] 616 g
Recommended Use:
road racing
Manufacturer Warranty:
2 years

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