SOC13: SRM Finalizes DA9000 Power Meter, Shows Prototype Rechargeable XX1 Model

2013 SRM Dura-Ace 9000 crankset power meter

SRM showed the final chassis design for the DA9000 model for the new Dura-Ace group.

Compared to the original prototype we saw at Interbike, this one has a larger diameter piece to maximize accuracy on Shimano’s new asymmetric bolt pattern. They found that the smaller design they showed last fall wasn’t getting the accuracy of existing systems, so they went bigger to deal with the offset forces and inconsistent torque patterns for left versus right leg forces.

The larger design also let them stick two batteries in it, which provides a whopping 3,000 hours of use. Not only do they say that number is a conservative rating, but that it should be up to six years of use without recharging. That’s a loooong time…

2013 SRM Dura-Ace 9000 crankset power meter

The original concept is on the left, the final is on the bike.

Pre-orders should start shipping now, and new orders should be able to ship on May 1.

Retail is $3,145 and includes the power meter, crankset and chainrings. It has to come as a complete crankset system because they send out the drive side crankarm to have the spider machined off so they can attach the PM to it.

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They have about 50 of these drilled with a standard 110 BCD 5-bolt pattern and the four hole Shimano 9000 pattern (above), but it’s probably not something they’ll keep making. So, if you want one that’ll let you run non-Shimano rings, get your order in now and request it.

2013 SRM XX1 and SiSL2 mountain bike crankset power meter with rechargeable batteries

New XX1-compatible prototypes for both XX1 and Cannondale SiSL2 cranksets usher in a welcome new feature. Not only does it fit their SRAM’s new asymmetric 74mm BCD bolt pattern, but it uses a new design that sits outboard of the chainring and uses a USB rechargeable battery.

2013 SRM XX1 and SiSL2 mountain bike crankset power meter with rechargeable batteries

That last bit is a first for SRM and will likely make its way into more of their products for 2014, meaning you won’t have to send your unit back in for a new battery like with all prior models. So, even though 3,000 hours is huge, being able to charge your own battery should overcome the mental hurdle of a completely closed, non-user serviceable system.

Comments

Bas Simons - 04/22/13 - 5:08am

great that they make their batteries rechargeable. i do wonder how often they recommend a recalibration of the system with those long lasting batteries…

Gly - 04/22/13 - 10:40am

I am all for measuring power with the XX1. Without more information and just looking at the design of the SRM for the XX1. It seems it would require the removal of the crank to change the chainring. Which removes that easy interchangeability that XX1 has.

Charango - 04/22/13 - 2:38pm

USB charge port for an item as expensive as this is a BAD idea. Looks like the same port that is Garmins, including the rubber “plug”. I have had the port corrode on several Garmins, which required a warranty replacement. It will likely get wet and corroded down there over time.

willy - 04/22/13 - 3:47pm

I talked to them about the USB at Sea Otter–seems they are simply testing the chassis and the USB plug is only to test the batteries and electronics–thus why it says PROTOTYPE. He said they were currently testing other connectors or sealed covers covers to avoid any USB issues. I was impressed with the amount of testing he said it was going through to avoid any possible issues

Mark - 04/22/13 - 3:48pm

Boo Hoo it may require removing the crank to change chainrings, it’s an XX1 powermeter be thrilled because their is no other way right now. The bcd is so small you can’t expect to “have your cake and eat it too”

Greg - 04/22/13 - 9:53pm

it takes nothing but a 10mm allen wrench to remove and reinstall the xx1 bb30 crankset. could not be easier.

Greg @ dsw - 04/22/13 - 9:58pm

What is most curious to me is, where in the world is SRM in 2013 still getting DA 7800 series driveside crankarms? Is shimano still making them especially for SRM? Or, did SRM buy up ten-thousand of them and store them in a ‘crankset fort knox’? Any ideas?

Jordan - 04/23/13 - 11:23am

Greg @dsw: My understanding is that Shimano still manufactures them specifically for SRM.

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