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S-Works Power Cranks – Dual-Sided

2.3

14 Reviews

No matter your skill level or experience on the bike, there's no better way to enhance…

Product Details

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No matter your skill level or experience on the bike, there's no better way to enhance your training and racing performance than by riding with a power meter. Lucky for you, we've combined our incredibly light and stiff carbon fiber S-Works road cranks with dual-sided power measurement, making it the lightest (440g/172.5mm) and most accurate power meter available. The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answer the "real-world" accuracy question.

To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real world scenarios (+/- 1.5%).

The Dual-Sided S-Works Power Cranks utilize separate strain gauge systems to individually measure the effort produced by each leg. This maximizes the accuracy of your total power numbers, plus it helps you to better understand your performance as fatigue increases and when you're recovering from injury. And with class-leading temperature compensation firmware and waterproof enclosures, Power Cranks are easy to live with. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze.

  • +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO.

  • Independent, dual-leg power measurement.

  • Works with ANT+ and Bluetooth® devices.

  • Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available).

  • Hollow carbon crankarms, carbon spider, and oversized alloy spindle offer superior stiffness and lighter weight than the competition—440 grams for 172.5mm crankarm length.

  • Fits Specialized road frames with OSBB or PF30 bottom bracket shell, as well as most BB30 road frames.

  • 110 BCD carbon spider (also compatible with 130 BCD carbon spider—sold separately).

  • Compatible with Shimano and SRAM drivetrains. Chainrings are sold separately. Use only with Specialized/Praxis chainrings 06217-1702 (52/36T) and 06218-1713 (50/34T).

  • Available in 165-180mm crankarm lengths.

Manual Downloads

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Rider Reviews

2.3

14 Reviews

 

Too Many Dropped Connections

The cranks are great but the power meter is unreliable. On almost every ride, I have multiple dropped connections, which totally throws your training metrics off. The dropped connections happen on both Garmin and Wahoo units. I am giving up and buying an another power meter.

Would Recommend?
No

Name:
Max

Helpful?

Worst power meter so far

I got these on my s works tarmac, it is the worst power meter that I ever had so far. Inaccurate and unreliable. Many of my friends who got these power meter had the same problems

Would Recommend?
No

Name:
Luis

Helpful?

Better off with Dura-Ace

I've never been able to get the left crack to connect to my Garmin or the Specialised Ap , so only shows right side power output. Have replaced the batteries but still doesn't work. Aside from that, I've had to replace the bottom bracket after one month, replace a spider with another, and adjust the cranks when they started to wobble.


Name:
Fairy

Helpful?

Problematic Power Drops and L/R Balance

Fit and finish is great but reliability is very poor. Power drops on many rides, sometimes never recovers. L/R balance figures are way off. I have Favero Assioma power meter pedals on my other bike and they have been flawless. Specialized needs to warranty these cranks.


Name:
Jon M.

Helpful?

Unreliable

I have used these on my Tarmac for 10 months . Left / right balance is inconsistent/inaccurate. Power stops working at random or gives inaccurate numbers and trying to recalibrate zero offset with the Phone App is a nightmare. Sometimes it works and sometimes it doesn't. Is it too much to ask for a power meter that just works . My power2max was faultless paired with my previous s-works crank. Hugely dissappointed and feel ripped off.


Name:
Alex

Helpful?

Has so much potential to be great.

I want to love this thing. The weight is top class. The looks is pretty much the best you can have especially on S-works bikes. Stiffness, fit, finish, everything's perfect. Where it goes downhill is the power data. I don't have dropout issues like others here. My issue is left / right balance. At first when I got 43/57 readings I thought I was just not balanced. Although in the past on dual meters I have been always within 49/51 range. Then when I'm coasting I get 0%/100% although I'm not pedaling. Worst offender is when I unclip one pedal and pedal only with the other foot. I still get anywhere from 20/80 to 30/70. Funny thing is the total power I see on the unit is on par with what I feel and the overall data is comparable with other power meters. (i.e. If I climb a hill at a certain time at X power, and then climb with another power meter at the same amount of time, power cranks show comparable average power to that X number of the other meter) Worst is the final part. I'm on my second power cranks unit. I sold the first one due to the above issues. Switched to a dura ace single sided 4iiii unit which works perfectly. This one I got on a new bike hoping maybe my previous unit was melfunctioning. Same issues.


Name:
Gurk

Helpful?

Specialized needs a recall, major safety concern!

At first I was blown away by this, though a bit hesitant with the external ""pods"". I was really only interested in the cranks, but you have no choice but power so we're taking a dive into that- previous cranks had an SRM spider. Everything installed very easy and was a smooth addition to my Tarmac... however, after getting ready to clean the bike I noticed the driveside power pod was half way on. I decided to wait a bit and see how it went but after traveling for business the whole thing had come off by the time of my arrival. I went to the nearest Specialized dealer and they promptly warrantied the cranks, but gave no explanation if this was a widespread issue. I went for one ride on them with no issue before traveling home. By the time I got home I went to check and the same power pod was half way off again. This time I decided to take it into my own hands and used some JB Weld for Carbon, we'll see how that goes although I'm interested in a response from Specialized. The first time these came off it went right into the drive-train so this is a failed product at best and a major safety liability at worst (ask SRAM). Who in their right mind thought using an adhesive on a stiff part exposed to high vibration stress was a good idea?


Name:
Nate C.

Helpful?

Must Have Power!

Love this set up-after install took about 5 min to download app, calibrate and start using. Really happy with this choice!


Name:
Daniel

Helpful?

Easy upgrade from S-Works Carbon Road Crank Arms

Works great on my Tarmac as a swap in replacement. Updated from a solidly operating Power2Max Type S spider (single) power meter on S-Works Carbon Road Crank Arms. I rode a 200 km, 400 km, and 600 km on these so far in silence. Occasionally the power and cadence drops out to zero. It appears to be remedied by stopping and restarting pedaling for a second. Not a show stopper, but it would be great if a firmware update resolves the drop out issue.


Name:
Duane

Helpful?

Random power drop out.

Love the cranks but hate that the power meter randomly quits communicating with my Garmin or Zwift App. It happens on most every activity on the trainer or ride on the road.


Name:
Virgil

Helpful?

Love the stiffness and weight

Love: 1. One of the lightest power meters and crank combos on market, 2. Stiff as you can get. 3. Makes a clean integrated look with my Sworks Venge and Tarmac disc frames. 4. Measures bilateral power and torque. Hate: 1. For some reason these drop signal around 47 minutes into riding swift as I am always at the top of Alpe Du Zwift or some other climb trying to get my PR. I am not sure if it is a Zwift issue or power crank issue but my Neo and Neo 2 power units do not do that. Would I buy these again? yes. On the road I don't see them dropping signals.


Name:
Sworks99

Helpful?

Absolutely love them

This is my second set of specialized carbon cranks(the first power ones). They have the same ""I don't care how strong you are, you cant flex me"" feel. It is my first power meter and it rocks. Alas I am only Cat 5, but being able to monitor the improvements in my power has given me a huge mental boost :). I am considering purchasing another set for the Crit allez I am building.


Name:
David G.

Helpful?

with cadence over 90 rpm Dropout

I bought a brand new specialized power crank, double sides and since the first time I have this issue, when my cadence is over 92 r.p.m. my garmin (I tried using edge 820 and edge 510) display shows zero cadence and zero power! instead under 90/92 r.p.m. It works fine, I can read the right power and the right cadence. Calibration offset is ok and it was always 1010. (calibrated) Now I must wait two or three months because actually in Italy they don't have replacement for it!


Name:
Luke

Helpful?

Seems to work fine..except when it drops

Overall the product seems to work well when it does indeed transmit data. Left / right leg information seems accurate, it seems to line up with various other powermeters I own. All good things. Except for the fact that it randomly experiences dropouts and this doesn't seem to be an uncommon complaint from others who have this. Until that issue is resolved I really can't recommend this to anyone, unless you are cool with looking down and randomly seeing ""----"" for their power reading.


Name:
Nutso

Helpful?