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Quarq
Elsa RS Power Meter Crankarms - BB30

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Brains and brawn.

Quarq's BB30 Elsa RS Power Meter Crank Arms marry three of our favorite technologies to come out of the industry in recent years. First, the BB30 bottom bracket, whose power transfer and ease of installation have made it the most enduring standard across manufacturers. Second, the Elsa RS is compatible with Shimano's gorgeous and lightweight four-arm Hollowglide chainrings in any combination — standard, compact, whatever. Third, the Elsa RS itself has brains and brawn. The brains: five strain gauges placed strategically throughout the aluminum spider in order to measure the Newtons you're dumping into the road with an industry-leading accuracy of 1.5%. The brawn: Quarq's Exogram Hollow Carbon crank arms.


The Elsa RS BB30 is a study in compatibilities. The first two are limiting: It only supports Shimano four-arm Hollowglide chainrings and only mounts into a BB30 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 freewheeling 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.


Details

  • Exogram Hollow Carbon crank arms
  • +/- 1.5% accuracy
  • OmniCal power measurement technology
  • Power Balance
  • Dynamic Temperature Compensation
  • ANT+ wireless communication with head unit (not included)
  • Compatible with Shimano four-arm Hollowglide 11-speed chainrings
  • Compatible with BB30 bottom brackets
  • Item #QRQ000C
Arm Material
Exogram Hollow Carbon
Arm Length
170 mm, 172.5 mm, 175 mm
Bolt Circle Diameter
110 mm
Bottom Bracket
BB30
BB Threading
English
Rings
2
Spindle
BB30
Compatible Components
Shimano Hollowglide 11-speed chainrings
Claimed Weight
[172.5mm, GXP] 616 g
Recommended Use
road racing
Manufacturer Warranty
2 years

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