EB13: SRM’s Shimano Dura-Ace 9000 Crankset Powermeter Gets Official, Rechargeable Batteries & PC8 in Beta

SRM-Shimano-Dura-Ace-9000-crankset-power-meter

When we spotted this at Sea Otter, it was in final prototype form with a promise to be unveiled at the fall tradeshows. Thankfully, they kept their promise and the new SRM Powermeter Shimano 11-Speed is official.

It’ll come available with either the 53/39, 52/36 or 50/34 chainring combos in all available crank lengths from 165 up to 180. Weight for the crankset and powermeter system is 790g with a 147.5 Q-factor. Retail is $3,295 plus shipping.

In addition to an all new design to take full advantage of Shimano’s super stiff, asymmetric chainrings, it also gets an upgraded battery that’s good for up to 3,000 hours. Or, as they put it, 600 hours of riding per year for the next five years.

If that’s just not good enough for you, they’re still working on their rechargeable battery option…

SRM-prototype-rechargable-battery-crankset-powermeter

Word from their reps is they’re still tinkering with a rechargeable battery in the power meters, but they’re coming. More details on that as they develop.

The more surprising part of the display was the new PowerControl 8 (PC8) head unit, which is leaps and bounds above the current PC7. It integrates Ant+, Bluetooth, WiFi and GPS to give it more data points and allowing it to communicate with more devices. Initial word is the Bluetooth will only be used to communicate to compatible devices (as in, an SRM app running on iOS or Android phones), not receive data from Bluetooth sensors. We had very limited time at their booth, so we’ll grab more details this week at Interbike.

SRM-prototype-rechargable-battery-crankset-powermeter

Comments

joe - 09/15/13 - 9:15pm

Any idea of PC8 will usable via ANT+ with non-SRM power meters (PowerTap, etc)?

T - 09/15/13 - 9:16pm

Just so everyone is clear, that is 4 powertaps and a Edge 510 for the price of one crankset. Does anyone who isn’t sponsored use these things?

PROEDGEBIKER.COM - 09/15/13 - 9:33pm

Love my Stages

jo mammy - 09/15/13 - 9:39pm

[deleted]

Jeb - 09/15/13 - 9:49pm

My question is where are they still finding new 7800 cranksets to make these (Shimano road) things? re-furbished used stuff maybe?

Ck - 09/15/13 - 10:12pm

I read somewhere that Shimano still makes them for SRM.

moragalc - 09/15/13 - 10:27pm

I love my Stages Power Cannondale SiSL2 crankset that is 500g, just as stiff if not stiffer with replaceable batteries. Oh and it was less than half the price. SRM has seen the writing on the wall and they are scrambling…HARD.

Psi Squared - 09/15/13 - 10:59pm

Does anyone who’s not sponsored use “these things”? Yes, of course.

tsutaoka - 09/15/13 - 11:04pm

i have a 7900 SRM. it just works…so i love it

shafty - 09/15/13 - 11:22pm

Powertap is so much better because when the hub bearings go bad you GET TO send your whole wheel back to Saris. The other fact that should be obvious is that only a crank/BB based pm reads true power output. All others are forced to read your output through drivetrain inefficiencies. The downside is really that SRM can’t be moved from road to mtb AND it’s expensive. You can’t move a PT back and forth either, but low cost makes it a non-issue.

MB - 09/16/13 - 12:03am

Stages FTW!!!

Guy - 09/16/13 - 12:37am

I see the Stages fans have this covered. I’ll see myself out.

Ham-planet - 09/16/13 - 12:38am

Since when do Shimano make asymmetric chainrings? Any pics?

Psi Squared - 09/16/13 - 12:57am

Hey, Bike Rumor editors: do you want to kill the bigoted comment from jo mammy or is that sort of trash tolerated now?

Psi Squared - 09/16/13 - 1:07am

Funny things: No power meter on the market reads “true power output” as there’s always some material between the feet applying the power and the power meter sensors and there’s always some hysteresis in the sensor and the rest of the power meter. It doesn’t matter because knowing “true power output” doesn’t change any aspect of training.

SRM is not scrambling to do anything as they’ve already stated they’re not interested in the economically priced end of the market.

gravity - 09/16/13 - 1:08am

Also, obviously the people wondering who use these things don’t work in high end bike shops, where customers clamor for these things. We’ve always had trouble with SRM just getting enough to meet demand.

rico - 09/16/13 - 1:11am

Woah that jew comment is so not cool. I use a quarq but I am not sponsored, not jewish, not rich. But I am fast as a cheetah and drive a 11 year old car so I can spend my zenny on bike parts.

rico - 09/16/13 - 1:18am

Power training is kinda crucial once you get beyond a certain point with training, racing, performance plateaus. In that sense I often wonder why high end bikes never spec’d with power meters. On the other hand some pros like Rodriguez (I think it was him) want power meters banned from pro tour. I guess that is a real purist. I can tell you it is a bit of a ball and chain once you get into it. It’s in your face telling you you suck if you aren’t pushing it.

gravity - 09/16/13 - 1:31am

Awesome. My “this guy sucks” comment about the anti-semite got deleted, his anti-semitic comment remains. Solid job, Bike Rumor!

joe - 09/16/13 - 3:13am

I own a powertap g3 and love it. But i drool over these things. would love to own one.

Metar - 09/16/13 - 3:57am

Right. So it’s official now, but I’ve had a woman on my team riding it for the past two months?

Although, she’s not the kind that thinks twice about the price, so maybe it was a pre-production unit.

zenny - 09/16/13 - 7:49am

http://www.youtube.com/watch?v=VahmjfpGbxc

Kristi Benedict - 09/16/13 - 8:01am

Hey guys, we have to sleep – that came in when we were not monitoring comments. Those comments are not tolerated (still) and it has been deleted.
-Kristi

Phill - 09/16/13 - 9:31am

One of the benefits of the new Shimano cranks is that you can swap out chain rings to go from “standard” gearing to “compact” without having to change the entire crank. Does the SRM support this as well or if you wanted to have both standard and compact options would you need two SRM setups. I’m just curious as it would be a shame to lose this great new benefit.

TC - 09/16/13 - 10:20am

@Jeb – I spoke with my local SRM guy two weekends ago and Shimano is now making the 7800 arms for SRM. Before, SRM was buying the cranks and machining the spider from the arm.

re: who uses these? I do. You would have to pry it from my cold, dead fingers before I gave it up. Best bike related investment I have made. The SRM just works. :-)

shafty - 09/16/13 - 11:36am

re>psi squared< I think we can assume these will be put on bikes that have pedals and cranks, so the only exception would be a pm that calculates your power from sensors not related to material deformation. You don't think trying to read through mud, slop, tire pressure, traction, drivetrain cleanliness, and all other sorts of friction is useful? Hysteresis may be a small issue, but the crank is the most firmly mounted component you could choose. SRM pms are clearly the highest quality product manufactured to measure human to bicycle power transmission. That also doesn't mean they're the best in all ways. The versatility of their system is lacking for an obvious and fundamental reason.

Psi Squared - 09/16/13 - 4:09pm

The versatility of the SRM system is only lacking if someone has requirements not satisfied by SRM features. Apparently, there aren’t masses of people with such requirements. I really doubt that there are many folks who need or want to know the power losses they are suffering as a result of pedaling through mud or slop, with low or high tire pressure, with iffy traction, and a dirty drivetrain.

MB - 09/16/13 - 5:11pm

@psi squared – the versatility is lacking for a large number of riders or the other manufacturers wouldn’t be so busy making their own.

I have the cash to buy an SRM for every bike I own but why would I when I can use an $800 stages crank on my ss mtb, geared mtb, rohloff mtb, fixie, road bike, and 36er, all of which have different gearing? Hell, I could outfit 4 of those with their own stages cranks for the price of putting an SRM on one. Just doesn’t make sense even if I wanted the additional features the SRM offers to go from <$150/bike to $3200/bike.

Bobaloo - 09/16/13 - 10:14pm

When did we stop asking what the difference is on a $800 ebay knockoff carbon frame from Taiwan, and comparing it to a$4000 big box brand frame, or a $9000-hand-made-in-California-Cervelo? All are frames. All are carbon. Hell give them the same geometry and what do you have? (….long pause for dramatic effect…) Yes! that’s right! There are differences…. in the details! The small subtle details which we all believe we are so in-tune with our riding to actually distinguish those differences.

I feel its safe to assume that the players in the power meter world who have been doing it for nearly 3 decades have some pretty good experience in measuring power. The companies who are newer, claiming the same technology or standards of measurement, are missing one critical part to the whole equation, and that is durability. How many Stages customers are set on expecting their $800 power meter will last more than a few seasons? Before the epoxy cracks around the edges of the plastic casing? water intrusion? out of warranty? Cranks are bending after all, right? Power tap hubs wear. the bearings needs replacing. How many of us can do that ourselves? then we exclaim user battery replacement is critical…? I bought a quarq last summer after listing to all the forums saying that quarq was the best and its been back twice and replaced twice.

Kicking myself I didn’t buy an SRM.

cliche or not, stereotypes are typical true and you get what you pay for. otherwise we would all buy the $800 carbon no-name frame off ebay. (its there, look it up “carbon road frame”)

bin judgin - 09/16/13 - 11:30pm

srm are better than all the other power meters. that quality comes at a price.

brad - 10/01/13 - 8:32pm

Why would I buy an SRM over Stages? Because Stages is only one-half of a power meter. I want to know the power produced by both my left and right legs. Stages only measures left leg power and multiplies by 2. People don’t produce equal power all the time with left and right legs (it could be 49-51, 48-52, 47-53, etc; and it could vary based on cadence and intensity). If you don’t care about total power produced, buy Stages. Otherwise, buy a complete power meter (e.g., SRM, Quarq, Powertap).

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