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  1. #1
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    What cranks to use?

    Hello,

    In january I bought a 2010 Specialized FSR XC expert.

    The specs say it has the following as cranks:

    Shimano FC-M521, Hollowtech, Octalink spline, replaceable rings with alloy outer, 175mm
    Now, about 5 years or so ago I bought this item:

    Shimano Cranksets - MTB LX Chainset HollowTech II M580 175mm 4-Bolt
    I was thinking the other day that maybe I could buy myself a new BB for my new FSR and swap the octalink cranks for the LX set.

    I could just do a direct swap of the chain rings but I was wondering if its worth the effort, are the LX set + BB much better than what I currently have?

  2. #2
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    The H2 is a good bit lighter. You might notice the weight difference and stiffness (or not). Doubt there would be a great difference in shifting.

    Retail h2 cranksets come with a bb - it's just two bearing cups with a plastic sleeve. You will need a crank puller and cartridge bb tool to remove the octalink and a different bb tool to install the h2.

  3. #3
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    Quote Originally Posted by rlouder View Post
    The H2 is a good bit lighter. You might notice the weight difference and stiffness (or not). Doubt there would be a great difference in shifting.

    Retail h2 cranksets come with a bb - it's just two bearing cups with a plastic sleeve. You will need a crank puller and cartridge bb tool to remove the octalink and a different bb tool to install the h2.
    I didn't think there would be any difference in shifting as I would just swap my current chain rings onto the cranks as they are new.

    I have all the tools to do the swap but was wondering if there would be any benefit of doing this.

    They do look a lot better due to not having ugly crank bolts.

  4. #4
    local trails rider
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    Just use the cranks that you have on the bike until you have some problems with them.

    "it IS possible that you are faster or slower than anybody else who is having at least as much if not more or less fun"

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