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  1. #1
    Junior Member
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    Apr 2006
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    Petersburg, Alaska
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    2001 GT Aggressor 3.0
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    How do I find the correct Bottom bracket for new cranks?

    Hey all! I have learned quite a bit just searching the last few days. I now know that I need a 68mm for my bike, but how do I find what spindle length I would need for a new set of cranks? I want to go with the Shimano Deore 170mm cranks.

    Thanks for your time y'all!

    Justin
    Last edited by JJXJ; 05-07-06 at 10:59 PM.
    2001 GT Aggressor 3.0

  2. #2
    likes avocadoes
    Join Date
    Nov 2004
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    oakland, ca
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    heh, like that info would fit here...
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    as usual, sheldon is a great source of info:
    http://www.sheldonbrown.com/bbsize.html

    and this took me exactly 15 seconds to find on shimano's site:
    http://bike.shimano.com/publish/cont...inline.pdf.pdf

    You may need to ask more questions (depending on how much you already know) about how to interpret the shimano site, but basically they are giving you the different configurations possible and the resulting chainline, which you will match up with your rear hub info to determine the proper bb.

  3. #3
    Junior Member
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    Apr 2006
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    I forgot to add the info about what is on the bike now. I have the Shimano Dual SIS system. The number on the crank arms is FC-C102-TY30. They also have Shimano YJ stamped into the backs of them around the pedal mount areas. The bottom bracket tube is 68mm, and the crank arms are 170mm.

    Thanks again!

    Justin
    2001 GT Aggressor 3.0

  4. #4
    Junior Member
    Join Date
    Apr 2006
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    Petersburg, Alaska
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    Hey! Thanks r-dub! I didn't see that you posted while I was posting. Thanks for the links. I don't see my application listed on either site though. I've been on the shimano site a lot lately, and I even emailed them mid-week last week. I just haven't gotten a response from them. So I figured I would come bother y'all...Thanks for any further help you guys can give. I really do appreciate your efforts!
    2001 GT Aggressor 3.0

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