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Old 11-29-06, 10:16 PM   #1
Gerdz
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Replacing bottom bracket - need advice.

I need to replace my bottom bracket, but need a little advice. I am replacing a TH Industries 7420AL in which one of the races disintegrated. I went to my bike shop and asked for a 68x118, which is what I understood to be the right unit for the BikeE. They sold me a Shimano UN73 Cartridge BB and said it was 118, but it is longer than the one I took out. I think it is a 122 and mine is 118.

Is there any problem with putting a cartridge in as a replacement for a non-cartridge?
Does the extra length hurt anything or do I need to track down a 118? There is only one chainring on the crank.
Is the UN73 a decent unit? It's on a long wheel base recumbent.

Any tips for when I put it back together? Is grease good or do I need antiseize?

Thanks,
Mike.
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Old 11-29-06, 10:26 PM   #2
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Have you measured the spindle on the old BB? The Q factor and chainline will be vastly different going from a 118 to a 122.
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Old 11-29-06, 10:33 PM   #3
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Near as I can measure, it's 118mm.

Thanks, I'll return the 122 and get a 118. Is it ok to put a cartridge unit in there?
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Old 11-29-06, 10:50 PM   #4
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yes, its fine
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Old 11-30-06, 12:53 AM   #5
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Un73s are good stuff. UN anything is pretty much gold.
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Old 11-30-06, 07:22 AM   #6
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there are 2 measurments you must be sure of 1 the length of the spindel and 2 the length of the bb shell if these match clean and face the shell before you install it and alway check your thread direction you don't want to cross threads
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Old 11-30-06, 07:42 AM   #7
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I've never seen a Shimano bottom bracket that didn't have the specs printed right on it. Usually in the middle of the barrel portion, between the two ends.

Bob
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Old 11-30-06, 10:53 AM   #8
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Un73s are good stuff. UN anything is pretty much gold.
UNdeniably.
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Old 11-30-06, 12:17 PM   #9
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Un73s are good stuff. UN anything is pretty much gold.
Phil wood ones are even better...
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Old 11-30-06, 05:17 PM   #10
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But a LOT more expensive.
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Old 11-30-06, 06:36 PM   #11
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Phil wood ones are even better...
better in price yes. If by better you mean more expensive.
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