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XTR Cranks for DH?

Discussion in 'Downhill & Freeride' started by potta, Mar 2, 2008.

  1. potta

    potta Chimp

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    XTR M970 are they strong enough for DH bike?
    Are any of you using them, what are your thoughts.

    Thanks in advance
     
    #1 -   Mar 2, 2008

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  2. Heath Sherratt

    Heath Sherratt Turbo Monkey

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    You can't use them for 83mm bb shells...sucks
     
    #2 -   Mar 2, 2008
  3. dhkid

    dhkid Turbo Monkey

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    if you are confident that you aren't going to hit anything with your pedals then yea, there is an argument that says cranks in dh dont see as high loads as hard tails do.

    but hitting rocks is totally different. i got a pair of xt cranks which has a slightly bent right arm now, i would definitely go for something like the gravity lights if i had to change cranks.

    Heath Sherratt - someone as actually used them on a 83mm bb bike. you get a 52mm chain line i think. check the sunday thread. he mounted the cranks with out the preload ring on the non drive side.
     
    #3 -   Mar 2, 2008
  4. potta

    potta Chimp

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    There are not loads of rocks on my local runs so that will help.
    I have been following that thread. That is what started me thinking about the XTR cranks
     
    #4 -   Mar 2, 2008
  5. JiveFoolSucka

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    The Athertons run them on their Commencals.
     
    #5 -   Mar 2, 2008
  6. DirtyMike

    DirtyMike Turbo Fluffer

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    First question to ask is how much do you weight with gear? That will make a diffrence on what cranks you can get away with running, personally I wouldnt put that much money into DH cranks. Its not a question of if your going to hit something, more of when with DH. I wouldnt personally want to run anything higher than the xt.
     
    #6 -   Mar 2, 2008
  7. dhkid

    dhkid Turbo Monkey

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    the athertons are also sponsored shimano japan, so i doubt they will worry about how long the cranks last.
     
    #7 -   Mar 2, 2008
  8. DirtyMike

    DirtyMike Turbo Fluffer

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    Thats a very good point
     
    #8 -   Mar 2, 2008
  9. potta

    potta Chimp

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    I weight 200 LB with all my gear.
     
    #9 -   Mar 3, 2008
  10. - seb

    - seb Turbo Monkey

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    Everyone used to use the old XTR cranks for DH, in fact I've had them on various bikes since 2000ish I think, and my current set have been going since 2003. I can only presume that the newers ones are at least as capable, if not more so. I'd have no qualms about running them other than initial outlay cost.
     
  11. -C-

    -C- Monkey

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    I'm running a set & no complaints from me. I'm about 190lbs kitted up & they are not noticably any more flexy than the Saints I ran for the 2 years prior.

    I pay roughly half retail for them, so once you sell the carbon/ti chainrings, they work out cheaper than XT/Saint anyway.

    Well recommended!
     
  12. manhattanprjkt83

    manhattanprjkt83 Rusty Trombone

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    i have them for my xc bike and dont think i would run them for dh they are to pretty...
     
  13. pinkshirtphotos

    pinkshirtphotos site moron

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    why spend so much money on cranks?
     
  14. Gary

    Gary "S" is for "neo-luddite"

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    took "somebody else" to notice you'd bent a set though, eh?:brows:
    you checked the current ones? :p
    ;)
     
  15. manhattanprjkt83

    manhattanprjkt83 Rusty Trombone

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    They are impressively stiff and really damn nice...
     
  16. - seb

    - seb Turbo Monkey

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    Nah, I've never bent the cranks, it's the BBs that go, they twist (I presume). Never had one break but I've replaced them 2 or 3 times to get my cranks realigned :)
     
  17. gratiflying

    gratiflying Chimp

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    presumably this relates to weight saving... here's the approx. weight of crank arms + bb that i'm running to put it in perspective:

    M970XTR: 600g
    M760XT: 690g
    M601 Hone (w/ steel pedal inserts): 715g
    Gravity lites: 800g (with XTR BB)

    i'm sure you could run the XTRs as long as you don't tag a pedal. i destroyed the XTs this way. for the $, strength and relative weight difference (100-200g), i prefer Hones or Gravity lites.
     
  18. potta

    potta Chimp

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    Thanks for the advice guys
     
  19. Biffff

    Biffff Monkey

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    Danm....I could drop a little under pound off my bike by running gravity lights. Assuming my Diabolus single ring setup weighs around 1100g's. Its probably not worth it though as my cranks have been bullet proof for 2 years.
    I don't think I'd run a pedal without stainless inserts for DH. Bikes are getting lower, your going to smash into things.
     
  20. Ian Collins

    Ian Collins Turbo Monkey

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    i just bent my gravity lites the other day......i was quite surprised.....may have to switch back to something stronger....we'll see how fsa is about warranty
     
  21. MttyTee

    MttyTee Monkey

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    Must be the extra weight from that bionic thumb!
     
  22. dhkid

    dhkid Turbo Monkey

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    damyum, guess if you want strong cranks, there is always saint.

    but then again barrel used to go through a few pairs of cranks in a race weekend on his old bike.

    those carbon cranks bcd was taking about dont sound too bad of an idea anymore. they dont get bend. hmm, who makes a external bb carbon crank?
     
  23. - seb

    - seb Turbo Monkey

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  24. Curious_George

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    are you serious? I mean are we so blindly obsessed with weight savings that we will disregard the obvious...this is DH, people...Carbon cranks will break...XTR/XT XC Gravity lights will bend...

    I thought we had balls around here>? most of y'all are starting to remind me of the Spandex wearing roadies who go on and on and on about switching through ultra light tubes and changing cranks/stems/bars every year in order to reap a few grams here and there

    ...simply enjoy ridding...most people spend WAY to much time specking their rides..eventually news stuffs comes in and this obsession never STOPS!!!

    all I have to say about this is

    LAY OF THE TSATSIKI SAUCE AND JUST RIDE!
     
  25. Heath Sherratt

    Heath Sherratt Turbo Monkey

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    What do you mean preload ring? There are bb bearings and then three spacers...do you mean the spinning preload ring attached to the left crank arm?
     
  26. davep

    davep Turbo Monkey

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    Yes. Go look at the Sunday thread up top. There are pics.
     
  27. dhkid

    dhkid Turbo Monkey

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    wow, just say the word carbon and you automatically assume its about saving weight.:clapping::disgust1:

    have you seen the pictures of the cranks that bcd has been using? i was saying they might be a good idea coz they have taken a beating and according to bcd are still absolutely fine. carbon isn't exactly the brittle extremely fragile material that most people make it out to be.

    if you actually spent any time reading this thread i have been suggesting against using xtr cranks for dh.

    think next time you decide to talk crap again.