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  1. #1
    mtbr member
    Reputation: connolm's Avatar
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    Carbon cranks and pedal strikes

    My bike has a low BB and suffers from a lot of pedal strikes. Does this mean I should avoid carbon cranks?

    How do carbon cranks hold up to strikes?

    The picture below shows the extent of strikes on my Specialized Stumpy 29er. It's only a year old and the crank already looks this bad.

    From Plastic Hub

  2. #2
    usually cranky
    Reputation: b-kul's Avatar
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    subscribed. i would like to know too.

  3. #3
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    I would say, from experience with carbon, not very well.

    Carbon has a high tensile strength but impact resistance is less than metal crank arms, I have stayed away from them for that reason on the MTB

    Just my opinion....

    KIN
    Yes its retro but IT WORKS!

    8 Speed is great and V-Brakes rock!

    Ex-wrench...have a Question just ask!

  4. #4
    Subject to Whimsy
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    Raceface SixC cranks with the plastic 'boots' for the crank ends.

    Carbon cranks and pedal strikes-carbon-crank-july-7th-2011-002.jpg

    This crankset has been running strong for about a year now and nothing but cosmetic scrapes and nicks.

  5. #5
    wyrd bi ful rd
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    Quote Originally Posted by KINBOY View Post
    ... impact resistance is less than metal crank arms ...
    as long as you keep them from direct impact you will be fine ... i have not switched to carbon components ... anywhere on my bikes ... yet

    Raceface SixC cranks + chainrings + BB = 760g (obtained online)
    XT cranks + chainrings + BB = 870g (weighed them myself)

    i know ... 100+g is a bit to save on ...

    but
    XTR cranks + chainrings + BB = 770g (obtained online) ...

  6. #6
    usually cranky
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    Quote Originally Posted by Slowup View Post
    Raceface SixC cranks with the plastic 'boots' for the crank ends.

    Click image for larger version. 

Name:	Carbon Crank July 7th, 2011 002.jpg 
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ID:	624578

    This crankset has been running strong for about a year now and nothing but cosmetic scrapes and nicks.
    it would be interesting to see pics of a previous metal crankset if you have some.

  7. #7
    wyrd bi ful rd
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    Quote Originally Posted by connolm View Post
    My bike has a low BB and suffers from a lot of pedal strikes ...
    I guess it depends largely how and where you ride ... you definitely have a lot of pedal strikes but it could be because you have a low BB, and so if you are using the cranks on a different bike, and you are confident there will not be as much strikes ... go for it ...

    I occasionally ride off-trail with lots of roots ... which is fine if you going downhill, but when going uphill, there are times when you definitely have to pedal, otherwise you will go backwards, and you know the pedal will strike, and so I do not wish to have the thought of whether that last strike was strong enough to damage my carbon cranks ...

  8. #8
    Subject to Whimsy
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    Quote Originally Posted by b-kul View Post
    it would be interesting to see pics of a previous metal crankset if you have some.
    Unfortunately I don't. My previous cranks were carbon as well.

  9. #9
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    This seems to go against what everyone is saying, but I've had some FSA carbon cranks for 2 years (bought the bike used, I think he had them 1-2 seasons) and they've taken some harsh blows. For reference, the last pair of Time ATAC Aliums I had only lasted a year because of my tendency to smash them. The end of the crank arms look a little rough, but they're holding up just fine. I've never used aluminum cranks, so I'm not sure how they stack up but I have yet to run into problems with mine.

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