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SRM DuraAce 9000 and 9050 Compact: Interchangeable Crank Arm Length

SRM DuraAce 9000 crankset

I had an interesting conversation with SRM today, the SRM power meters having been reliable solutions for me over years on Moots Vamoots RSL and Moots Psychlo X RSL and other bikes prior (one bad Reed switch quickly fixed last year, nothing’s perfect).

I learned several things which might not be news to all, but bear repeating:

  • The latest DuraAce 9000 / DuraAce 9050 compacts can take interchangeable crank arm lengths without any recalibration of the SRM needed, though these are a special crank arm made for SRM by Shimano (Shimano FC-SR70).
    The rings can also be swapped out for another size.
  • The DA 9000/9050 battery life is up to a whopping 3000 hours, which is good for many years of life (2 hours a day or riding = 1500 days = 4 years), which is a very long lifetime).
  • A new PC8 head unit is due out in late summer which will support ANT and GPS and Stages power cranks, the latter being exciting to me so I can run power on my mountain bikes, which I’ve long wanted.

Nothing shifts like DuraAce and so maybe I will bite the bullet and get one set up with 172.5mm crank arms, but also with a set of 170mm crank arms because I want to try the 170mm size once my body (legs) settle down.

My Cannondale Hollowgram SI/SL crankset might be upgradeable, and I’m likely to sell that too, though the ~250 gram weight savings is really appealing for the Everest Challenge.

See also Pioneer Electronics power meter.


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