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Old 02-15-14, 12:09 PM   #1
danstar10
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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
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Old 02-15-14, 12:14 PM   #2
fietsbob 
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You Could ask the shop you are buying it from..
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Old 02-15-14, 12:33 PM   #3
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I'm buying online to keep costs down
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Old 02-15-14, 01:32 PM   #4
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ask those people, then. they have Email too ..
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Old 02-15-14, 01:39 PM   #5
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Very few merchants would sell a crankset without knowing what spindle it takes, and usually would have it as well.
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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!
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Old 02-15-14, 02:56 PM   #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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