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Correct me if I'm wrong

Old 03-11-07, 03:25 PM
  #1  
Ymmie
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Correct me if I'm wrong

It is impossible to install a bottom bracket backwards as the threads are reversed on one side.
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Old 03-11-07, 03:33 PM
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Originally Posted by Ymmie
It is impossible to install a bottom bracket backwards as the threads are reversed on one side.
It is not impossible if you try really, really hard. Which you shouldn't. Do a search and you'll read the woes of those who have succeeded the impossible.
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Old 03-11-07, 03:40 PM
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Let me rephrase that.

To correctly install a bottom bracket, it is impossible to install backwards as the threads are reversed on one side.
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Old 03-12-07, 10:00 AM
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It wouldn't be correct if it was backwards.
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Old 03-12-07, 10:11 AM
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Am I right or wrong?
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Old 03-12-07, 11:26 AM
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most mountain bikes have an english threaded bottom bracket. these are left hand threaded on the drive side and right hand threaded on the non drive side.

the only way to install these backwards would be to cross thread, and that takes a considerable amount of force (you'd know you were doing it)

there are, however, types of bottom brackets that are right hand threaded on both sides. italian is probably the most common. these can be installed backwards and will actually work.

i've never seen an italian threaded mtb, but there's lots of stuff out there i haven't seen. if you think you've got one please post pics!

here's a table of bottom bracket shell diameters and threadings.

Last edited by dirtyphotons; 03-12-07 at 11:42 AM.
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