My BB strange but true

Wester

Veteran
i have a MTB which i had not used for a long time but in the last 3/4 months i have been useing it a lot
When i started cycling on it again the BB was pretty loose with quite an amount of play in it however now it has tightened up where there is very very little play in it . it is a sealed BB

I find this very strange could somebody explain the reason for it
 

accountantpete

Brexiteer
BB shells are threaded so that the BB doesn't unscrew. The drive side threads on anti-clockwise and the left threads on clockwise.

The cranks turn against this tightening and you would think that the cups would unscrew -but due to thread precession they actually tighten.

Reply edited to correct the complete load of garbage I originally posted
 
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