Thank you for purchasing through links and ads on this site.
diglloyd Deal Finder...
Buy other stuff at
Get up to 16x more storage and 2x the speeds of the original drive

SRM DuraAce 9000 (11-speed)

Last updated 2014-03-10 - Send Feedback
Related: bicycle power meter, gear, Road Bikes, Shimano, SRM
SRM DuraAce 9000 50 X 34 power meter crankset

The SRM Power Meter 9000 is the latest SRM power meter supporting DuraAce 11 speed.

With up to 3000 hours of battery life, it’s a multi-year install-and-forget solution. That’s so long that the chainrings are likely to wear out before the battery.

Your author has used SRM power meter for over three years as this was written (with PC7 head unit), and they have proven highly reliable.

In use

The Moot Vamoots RSL is still running a 10-speed Shimano DuraAce Di2 drive train and 10-speed chain (as of Spring 2014, see notes on Lightweight wheels also). This combination is working just fine with the DuraAce 9000 crankset.


WIND weighed the SRM 9000 50 X 34 crankset before it was installed on the bike.

Right crank and chainrings: 555g
Left crank: 181g
Locknut: 5g
TOTAL: 741g
+6g for cadence magnet as shipped

A plain (non-SRM) 9000 crankset is spec'd at637 grams (not independently verified by by weighing), so the SRM setup extracts an approximate weight penalty of a very reasonable ~104 grams.

In short, the SRM 9000 DuraAce penalty is no more than 90 grams over the Hollowgram, and probably much less for the latest dual-battery Hollowgram setups. Of course one can run flimsy warpable chainrings on the Hollowgram to save more grams, but that is not a serious proposition for reliable use.

Data has to be displayed and recorded to be useful: the PC7 head unit and its mount add 65+ 15 = 80 grams.

Summarizing: for an SRM DuraAce power meter, there is a weight penalty of ~190 grams versus going without a power meter and without a head unit of any kind.

When one considers that a Garmin or similar with mount and cadence magnet and speed sensor chews up about half that difference, the SRM power approach looks pretty awesome for what it does.

Head Unit

Power measurement is transmitted to the Power Control 7 wirelessly from the strain gauges in the SRM Power Meter crankset. Other head units can be used also, such as the Garmin Edge 500 or 800 models.

See the discussion of how SRM measures power. As shown, the power shipped from SRM.

Continues below.

View larger, view HD.

SRM DuraAce 9000 50 X 34 power meter crankset

SRM description

Overall description as per SRM

The new SRM PowerMeter 11-Speed is the next generation of seamless drivetrain integration for Shimano groupo users and Power enthusiasts.

Improving over the 7900 series SRM PowerMeter, the 11-Speed now boasts 3000 hours of battery life! Electronic shifting systems make gear changes faster and virtually eliminate missed shifts, but the forces on the chain rings are much higher than with mechanical derailleurs.

With this in mind Shimano developed new Dura-Ace 9000 chain rings which are 20% stiffer than previous rings. This not only benefits the shift, but also in power transfer from the crank arm through the spider and into the drivetrain. If you ride Shimano DuraAce 9000 mechanical or Di2 electronic, you will benefit from increased power transmission!

Available models: SRM-Shimano 11-Speed: 110mm BCD (53/39), (50/34), (52/36)

Lloyd’s Sony Mirrorless Wishlist
Hand-picked items for Sony.

Details as per SRM

Powered By Experience — Each SRM PowerMeter and PowerControl head-unit is made one at a time, by hand. Our production facilities are located in Jülich, Germany and Colorado Springs, USA. Every step of production is carried out by highly trained engineers and technicians who have a passion for quality craftsmanship .

Accuracy is Everything — SRM uses a 144 point calibration protocol against a known mass measured to the exact gram. With precise calibration and our Auto-Offset feature, the resulting power measurement of the SRM has error of less than 1%. The scientific community has been publishing peer reviewed research for over 20 years using the PowerMeter as the bench mark for measuring power in physiological and human performance research studies. We don't claim anything, our accuracy is proven.

Dependability you can count on — Each SRM system is designed to withstand the rigors of training and racing in all conditions! The internal battery of the SRM PowerMeter allows for worry-free training while maintaining the industry's leading waterproof PowerMeter design. A three-year global warranty against defects backs up your investment and offers peace of mind. SRM maintains its hard earned industry leading accuracy and data transmission to yield unrivaled power measurement performance!

Race Proven Durability — PowerMeters are designed to take whatever you can throw at them. Each SRM is sealed against water, snow, mud, sand, and cleaning solvents. SRM PowerMeters are designed to work. We back that up with a three-year global warranty. If you can break it, we'll fix it.

WIND would add that SRM service has been excellent. A product is the sum of hardware and software and service; it is not a box and a spec sheet.

Best Deals, Updated Weekly
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 47 min unless noted. Certain deals may last longer.
$1129 SAVE $570 = 33.0% $16 FREE ITEMS Canon 18x50 IS Image Stabilized Binocular in All Other Categories
$2797 SAVE $600 = 17.0% $246 FREE ITEMS Nikon Z 7 Mirrorless in Cameras: Mirrorless
$2598 SAVE $600 = 18.0% Sony a7R III Mirrorless in Cameras: Mirrorless
$3498 SAVE $1000 = 22.0% Sony a9 Mirrorless in Cameras: Mirrorless
$898 SAVE $100 = 10.0% $145 FREE ITEMS Sony DSC-RX100 VA in Cameras: Point and Shoot
$1349 SAVE $150 = 10.0% $111 FREE ITEMS ZEISS 18mm f/2.8 Batis in Lenses: Mirrorless
$1169 SAVE $130 = 10.0% ZEISS 25mm f/2 Batis in Lenses: Mirrorless
$1169 SAVE $130 = 10.0% $90 FREE ITEMS ZEISS 40mm f/2 Batis CF in Lenses: Mirrorless | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__