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Discussion Starter · #1 ·
The mfg suggests having a "professional" chase & face the threads on the BB shell. However, if the old one came out fine and I clean the living S out of it and the threads look magnifico, and the new one is the same mfg, is this really neccesary?
 

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saddle tramp said:
The mfg suggests having a "professional" chase & face the threads on the BB shell. However, if the old one came out fine and I clean the living S out of it and the threads look magnifico, and the new one is the same mfg, is this really neccesary?
Nope. as long as there was a BB in the bike before, you should be fine.
That being said, if you are going to an external BB (if you didn't have one before), consider getting the BB shell faced. This ensures the sides of the BB shell are parallel. It improves smoothness and BB life as the bearings must be parallel.
 

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Discussion Starter · #3 ·
The previous bb was an isis. But the shell faces measure parallel according to a dial caliper...

not to mention I rode a couple hundred miles over the weekend only to wrench my lower back busting a crank bolt loose while in the basement, oh the irony...
 
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