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Kai
Joined: 11 May 2007
Posts: 107
Location: London
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 Posted: Mon Jul 04, 2011 5:07 pm Subject: Why is right side of bottom bracket a left hand thread? |
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I've just replaced my bottom bracket okay, but wondered why the right side (crank set side) has a left hand thread.
The left side has a normal right hand thread.
With pedals, I know that the concept of having left/right thread is for safety; so they will tend to tighten rather than loosen whilst riding.
The bottom bracket however is in the fail-unsafe way. This way both the left and right side will tend to loosen; though this is quite unlikely.
I can understand that it might be cheaper to tap the (female) thread all the way through the bracket, so this will explain why there is a left thread at all, but why not just flip it round so that it's in the fail-safe direction?
The component I changed was: Shimano UN54 Bottom Bracket Square Taper - 73-118mm
Comments welcome. |
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dan_b
Joined: 15 Jun 2004
Posts: 2428
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Kai
Joined: 11 May 2007
Posts: 107
Location: London
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| Posted: Mon Jul 04, 2011 9:36 pm Subject: |
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That explains it! Every day is a school day.
Thanks Dan. |
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