What is the correct replacement for my bottom bracket
08-13-13, 06:28 AM
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What is the correct replacement for my bottom bracket
Hi,
I would like to replace my old 3 piece bottom bracket with a new cartridge bottom bracket. The spindle length is 112.3 mm measured by a digital caliper. The shell length is 68 mm. There is 1.37 x 24T written on it.
There are several types of square taped brackets. I am not sure which one is mine. Also, what bb do you think would match.
Shimano UN 25 is in sizes 112 or 113 mm brackets but a better one UN 54 is only 110 and 113mm. Is there a chance that any of them will work?
Thanks
08-13-13, 06:35 AM
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Hi,
I would like to replace my old 3 piece bottom bracket with a new cartridge bottom bracket. The spindle length is 112.3 mm measured by a digital caliper. The shell length is 68 mm. There is 1.37 x 24T written on it.
Shimano UN 25 is in sizes 112 or 113 mm brackets but a better one UN 54 is only 110 and 113mm. Is there a chance that any of them will work?
I would like to replace my old 3 piece bottom bracket with a new cartridge bottom bracket. The spindle length is 112.3 mm measured by a digital caliper. The shell length is 68 mm. There is 1.37 x 24T written on it.
Shimano UN 25 is in sizes 112 or 113 mm brackets but a better one UN 54 is only 110 and 113mm. Is there a chance that any of them will work?
Remember how big a millimeter is- there's a lot more wiggle room than anyone seems to want to admit.
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08-13-13, 08:10 AM
#3
Thrifty Bill
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I would use a UN26 in the 113mm spindle length; $10 on line from several sources.
08-13-13, 10:48 AM
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What's wrong with the current unit? Looks pretty decent to me; even has neoprene seals around the spindle hole. Unless there's some egregious problem, simply cleaning it out and replacing the balls ought to be all that's needed.
08-13-13, 04:48 PM
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Thank you all for replays. Actually, there is no problem with current unit at all. I have recently bought this bike as second hand and I just thought that I could upgrade the dirty 3-piece bottom bracket to a nice and clean cartridge one.
08-13-13, 04:53 PM
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The 110 will work fine... you have 1 mm shorter at each side, doubt the chain will notice. Even the 113 will work just fine too, half mm at each side.
08-13-13, 06:46 PM
#7
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Best thing to do is get the size code off the spindle.
It should be something like 3-A, 3-P or similar.
Then go to Sheldon's spindle DB and pick the symmetrical equivalent.
https://sheldonbrown.com/bbsize.html
It should be something like 3-A, 3-P or similar.
Then go to Sheldon's spindle DB and pick the symmetrical equivalent.
https://sheldonbrown.com/bbsize.html
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