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Quarq Elsa RS Power Meter Crankarms - BB30


Item # QRQ000C

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  • Black, 170mm ($1,449.00)
  • Black, 172.5mm ($1,449.00)
  • Black, 175mm ($1,449.00)
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Item # QRQ000C

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.

  • 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

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, GXP] 616 g
Recommended Use:
road racing
Manufacturer Warranty:
2 years

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I have a 2015 GT Grade Ultegra Carbon it has a Praxis Works PF30 BB adapter With Shimano Compact Crank, I'm looking to purchase a Quarq Elsa power meter for this bike. Can you please advise on the correct model ( I think it's the RS version but I'd likeconfirmation before buying online.
Kind regards Ian

Hi Ian,

Yes you will want the RS version to work with your bike and Shimano rings.

Unanswered Question

Is Quarq Elsa RS Power Meter Crankarms - BB30 compatible with Cannondale factory spider on Cannondale's Hollowgram SISL2 crankset? I have just purchased a Cannondale Slice Dura Ace DI2 and I am looking for a compatible powermeter.

Avg. ride time: 17h 11m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Good training tool

  • Familiarity: I've put it through the wringer

I have had this power meter for nine months and have put over 9000 miles on it. I use it with my Garmin 510. It is very easy to use and gives you lots of data to study during and after a ride. I thought I would just be using the instantaneous and the average power readings but there is also the 30-second average to measure short exertions, there is the normalized average which tries to estimate you true potential on the ride, there is the threshold power which tells you how hard you worked over the course of the ride. The last number is interesting. I can do two rides with the same distance, same average heart rate, and same average speed but if the threshold power readings are different I can tell which one will be greater before even looking.

Calibration on the Garmin is easy but needs to be done each ride. The power meter is temperature sensitive and so I put it outside for a half hour or so before heading out so it can thermally equilibrate and then I calibrate it. One can easily change the CR2032 battery on the crank when it is (rarely) needed (ever few thousand miles or so). I charge my Di2 far, far more frequently than changing the battery in this power meter.

My only problem was after about six months the unit was draining the watch battery first over several days and then over several hours and then over several minutes and finally in a matter of 20 seconds. I thought it was due to the sudden cold weather we were getting or bad batteries but when I called Quarq they decided it was a short in the system. I sent it back to them. They replaced the power unit and returned it in less than a week. I did this by visiting my local bike shop and giving them the shipping information.

The way I ride changed because of the power meter. It will (by default) average in zeroes when you are riding. I found that this really disturbed me so I began pedaling through the crests of hills and down hill and more so on flats. I wasn't going to have my averages ruined. Essentially I just started pushing harder. The normalized average takes care of these zeros but the regular average (by default) does not so it is a real motivator.

I never considered a power meter that would go on the hub (I ruin wheels too often as it is) and I wasn't convinced the Garmin Vector was really every going to work properly. I knew I wanted the measurements on the crank. It is a major investment but I feel worth it.