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  1. #1
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    Help figuring out the correct replacement BB and crankset combo

    So after a hell of an ordeal getting a set of old cranks off and bottom bracket out, I now need to figure out which replacement parts to order so I would really appreciate any advice!

    Here are the details:
    Old BB was 68mm * 117mm
    Old crankset was Shimano Altus with 38 31 22 rings or something similar
    The front derailleur is BB mounted

    So far I have found two cranksets that seem suitable:
    http://www.chainreactioncycles.com/s...t/rp-prod46021
    http://www.woollyhatshop.com/Crankse...prod_3149.html

    and here are the shimano techdocs for both of those:
    M442
    http://techdocs.shimano.com/media/te...9830657937.pdf
    FC131
    http://techdocs.shimano.com/media/te...9830758324.pdf

    So from what I can derive it looks like the fc131 needs a 122.5mm spindle, but I cant figure what the M442 needs. There is also the (-E) and (-K) prefixes that I know relate to front derailleur type but I don't get how to use that info - can anyone shine some light on that? As I said my derailleur is mounted on the bottom bracket. If it says (-e) after a certain bottom bracket, does that mean it is what I should use, and (-k) I should not use?

    So can anybody figure out which crankset / BB spindle length combo I should go for?

    As for the BB I guess I will go for UN-26 or UN-55

    Thanks in advance

  2. #2
    coprolite fietsbob's Avatar
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    You Could ask the shop you are buying it from..

  3. #3
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    I'm buying online to keep costs down

  4. #4
    coprolite fietsbob's Avatar
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    ask those people, then. they have Email too ..

  5. #5
    Mechanic/Tourist
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    2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
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    Very few merchants would sell a crankset without knowing what spindle it takes, and usually would have it as well.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

    If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  6. #6
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    Is the bottom bracket not also specific to my front derailleur setup? Do you think I would be able to ask the merchant directly then? I hadn't thought of that.

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