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  1. #1
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    Crank based power meter with Dura Ace 9000

    I'm considering getting a power meter, maybe a quark or something crank based, but I thought the spacing of the new DA 9000 rings were a little different from before due to 11spd, etc. I don't want to affect my shifting which is absolutely stellar.

    Anyone out there using a similar set-up that can help with some advice?

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    Stages makes a DA 9000 crankarm. I don't know if their stuff is any good yet.
    ...

  3. #3
    powered by Racer Ex gsteinb's Avatar
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    I've been told 7800 SRMs shift fine with 9000.

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    Disgruntled Grad Student seejohnbike's Avatar
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    Not using a similar set up, but the google-bot quickly led me to this: http://www.excelsports.com/main.asp?...jor=1&minor=13

    So, spacing is the same.

    get whatever, get 11sp rings for it. Unless you want to shell out mad ducats for a DA9000 SRM, you won't get EXACTLY the same tooth/ramp/pin profile as the 9000 rings (unless I missed an announcement about shimano DA rings for non-wacky cranksets), but there are plenty of tried and tested options for 11sp rings that should suit you well enough.
    If we knew what we were doing, it wouldn't be called research.

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    powered by Racer Ex gsteinb's Avatar
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    Quote Originally Posted by seejohnbike View Post
    Not using a similar set up, but the google-bot quickly led me to this: http://www.excelsports.com/main.asp?...jor=1&minor=13

    So, spacing is the same.

    get whatever, get 11sp rings for it. Unless you want to shell out mad ducats for a DA9000 SRM, you won't get EXACTLY the same tooth/ramp/pin profile as the 9000 rings (unless I missed an announcement about shimano DA rings for non-wacky cranksets), but there are plenty of tried and tested options for 11sp rings that should suit you well enough.
    vaporware

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    hmm thanks for the advice I'll take a look. I've heard about the stages but not many reviews on accuracy. Albeit my intent is power for fitness and not racing so perhaps +/- a couple of watts won't make a huge difference to me especially since I have no comparison.

    looks like the SRM is for older DA, nothing on the new yet.

    Thanks Seejohn... I'll take a look at the options, I know it sounds silly but I'm hoping to get intel as well from someone who may be using it, the shifting really is so nice that I'd hate to give it up!

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    Disgruntled Grad Student seejohnbike's Avatar
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    Quote Originally Posted by gsteinb View Post
    vaporware
    Huh? http://www.fascatpowermeters.com/srm...00-powermeter/
    'In stock'?
    If we knew what we were doing, it wouldn't be called research.

  8. #8
    Disgruntled Grad Student seejohnbike's Avatar
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    also, robby: if not here, then I'm sure over at weightweenies they'd be able to get you sorted as for what would shift the best...
    If we knew what we were doing, it wouldn't be called research.

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    wow just found the SRM one, you were right, $3100+ no chance. Stages is $899 for the crank alone. Anyone out there using it? I get a great price on Quarq though so if anyone is using one for their 11spd DA I'd love to hear it.

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    Quote Originally Posted by seejohnbike View Post
    also, robby: if not here, then I'm sure over at weightweenies they'd be able to get you sorted as for what would shift the best...
    thanks, I'll check there later. I had this in road forums and they suggested posting here as well.

  11. #11
    soon to be gsteinc... rkwaki's Avatar
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    Quote Originally Posted by robbyville View Post
    thanks, I'll check there later. I had this in road forums and they suggested posting here as well.
    Thanks, now get out. This is an exclusive club of meatheads...

    J/K - hope you get it sorted out...
    "if you ride it the way it's meant to be ridden there's no way any wife is less of a ***** than a bicycle." - gstein

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    Quote Originally Posted by rkwaki View Post
    Thanks, now get out. This is an exclusive club of meatheads...

    J/K - hope you get it sorted out...
    indeed, thanks

    I'm an ex racer, that should count for something!

  13. #13
    I need speed AzTallRider's Avatar
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    I have DA9000 and use the 7900 SRM (which is actually 7800 cranks with 7900 rings). It shifts great - far better than 7900 does, because the 9000 FD is a massive improvement.

    I haven't tried it, but allegedly you can also use a 9000 crankset in a 7900 drivetrain, so long as you use a 9000 chain.

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    powered by Racer Ex gsteinb's Avatar
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    Quote Originally Posted by seejohnbike View Post
    odd. it's not on SRM's site that I see.

  15. #15
    fuggitivo solitario echappist's Avatar
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    i called SRM about it. Same price as the 7900/7950 SRM units.

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    Quote Originally Posted by valygrl View Post
    Stages makes a DA 9000 crankarm. I don't know if their stuff is any good yet.
    avoid.

    Quote Originally Posted by gsteinb View Post
    I've been told 7800 SRMs shift fine with 9000.
    it is true.

    Quote Originally Posted by seejohnbike View Post
    get whatever, get 11sp rings for it. Unless you want to shell out mad ducats for a DA9000 SRM, you won't get EXACTLY the same tooth/ramp/pin profile as the 9000 rings (unless I missed an announcement about shimano DA rings for non-wacky cranksets), but there are plenty of tried and tested options for 11sp rings that should suit you well enough.
    it's basically the same price as the DA 7900 SRM.

    11s rings are not necessary--it is mainly the chain and cogs (of course) that are different for 11s setups.

  17. #17
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    Quote Originally Posted by gsteinb View Post
    vaporware
    no, it definitely exists. i've seen and sold one.

    Quote Originally Posted by robbyville View Post
    hmm thanks for the advice I'll take a look. I've heard about the stages but not many reviews on accuracy. Albeit my intent is power for fitness and not racing so perhaps +/- a couple of watts won't make a huge difference to me especially since I have no comparison.
    without going into a whole diatribe, you should care about both consistency and accuracy. the stages is not yet proven (in fact, early signs are that there are issues with the data). as someone new to power, you don't realize that over time you may use multiple devices (think about quarq warranty returns, as an example), or you may switch devices (e.g., upgrade to SRM or some other brand), or you may get power for a 2nd bike, or you may move on to the next big thing in 5-10 years. if you don't get a device now that is both consistent and accurate -- or that does not allow for end-user calibration with a known weight (stages does NOT do this, which is a problem IME) -- then you risk collecting data for a while that will not be comparable to future data.

    i have personally had that happen and hope to help others avoid the scenario. when you get attached to numbers (e.g., your best 5' effort), if you later find out they are not real it is very hard to give that up.


    Quote Originally Posted by robbyville View Post
    looks like the SRM is for older DA, nothing on the new yet.

    Thanks Seejohn... I'll take a look at the options, I know it sounds silly but I'm hoping to get intel as well from someone who may be using it, the shifting really is so nice that I'd hate to give it up!
    you would still use the 9000 derailleur, which is great. the rest of the quality of shifting has to do with the stiffness of the rings. 7900 rings are fantastically stiff and shift great. don't think you will be disappointed there.

    the SRM 7800, 7900 and 9000 all use the same (7800) arms, custom machined by SRM.

    Quote Originally Posted by robbyville View Post
    wow just found the SRM one, you were right, $3100+ no chance. Stages is $899 for the crank alone. Anyone out there using it? I get a great price on Quarq though so if anyone is using one for their 11spd DA I'd love to hear it.
    if someone quoted you $3100+ for 9000, then that is way off. reach out to me as i can get you something for far less.

    avoid the stages. repeat: avoid the stages. go with quarq instead (though quarq has never had a power meter for shimano cranks -- they DO have some other great models that will work just fine with the rest of your 11s DA drivetrain.

  18. #18
    Resident Alien Racer Ex's Avatar
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    You can get a used SRM 7800 for around $1500. I'd go that route before I'd go to anything else.

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    Quote Originally Posted by Racer Ex View Post
    You can get a used SRM 7800 for around $1500. I'd go that route before I'd go to anything else.
    i have seen many great deals on SRMs--particularly used wired units (which are very reliable).

    there are deals on used quarqs as well, of course. i have added 7900 rings to many quarqs, which is a good option for shifting.

  20. #20
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    I paid $500 complete w/ BB, rings, and cables for a wired SRM a few months ago.

    Rock solid, won't be buying another quarq - even though I have had no problems in the last 2.5 years w/ mine, enough other people have had problems to probably send me elsewhere.

    I'll second teton... for lots of somewhat nerdy reasons, avoid the stages stuff for now.
    Quote Originally Posted by shovelhd View Post
    If it comes down to a field sprint, you probably won't win, so don't let it.

  21. #21
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    Quote Originally Posted by tetonrider View Post
    i have seen many great deals on SRMs--particularly used wired units (which are very reliable).

    there are deals on used quarqs as well, of course. i have added 7900 rings to many quarqs, which is a good option for shifting.
    guys thanks so much for the advice, I will avoid the stages!
    So assuming I can put 7900 rings on one and still have my nice shifting... I can get a quarq Elsa, new for around $1400 plus the cost of the rings I assume. Worth it?

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    Quote Originally Posted by Hida Yanra View Post
    I'll second teton... for lots of somewhat nerdy reasons, avoid the stages stuff for now.
    the trouble is that someone new to power can be seduced by lower prices or the claims from companies like stages that seem to make sense. it's not until a few years down the road when something like the inability to calibrate at home (and a product's instability) reveals problems that have been going on for a few years and have corrupted data.

  23. #23
    powered by Racer Ex gsteinb's Avatar
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    I wanted the stages to work (they're still not available), but in the end I bought a second SRM for my training bike.

  24. #24
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    Quote Originally Posted by gsteinb View Post
    I wanted the stages to work (they're still not available), but in the end I bought a second SRM for my training bike.
    i'd love for it to work, too. the truth is that so many companies have gotten into the game with the notion of 'we will build an accurate power meter that is cheap (less than $1k).' i was just an interested consumer with a limited budget, but when quarq was starting up they used to publish updates on their blog, and i believe their goal was a sub-$1k power meter that rivaled the accuracy of SRM. perfect--i couldn't afford an SRM at that time.

    as the months and years passed, what i suspect happened during their development process was that it turns out to be pretty darn hard to build a power meter that is durable and reliable. when they launched, prices were something like $1,800 or so (if memory serves--i recall getting my first specialized unit in 2008 or 2009). so, it was cheaper than SRM by a bit, but not 1/2 the price.

    more recently we have heard companies announce they have that goal of producing a great unit for little money and they have failed to deliver any product (metrigear, brim brothers, and more)....or we have seen that some companies (stages) have come out with a product, but it hasn't met the accuracy goals and has yet to be proven in terms of durability.

    25 years down the road and no one has been able to substantially knock down the gold standard. the promise is there, but let's face it--neither a quarq nor an SRM is a "cheap" option (purchased new at retail).

  25. #25
    powered by Racer Ex gsteinb's Avatar
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    I've seen Stages in the field, but it's been unavailable for so long as far as I'm concerned it's simply vaporware.

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