Technical & Reference Section > Tech and Restoration

Proud bb bearings

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rick1970:
repop redline twin pinchers ; the bb bearings have a habit of sitting proud on one side when fitted and i cant remember which side it was or should be ?   :crazy2:

nosepickben:
Neither should be proud, I have removed and re-fitted mine today in another frame, they were a bugger to remove because the spacer tube was a little too wide so I couldn't get my bashing tube to contact with the inner face of the bearings/cups to knock them out after I had removed the crank arms and spindle. Got them out eventually thogh. When I re-fitted them, the bearings/cups went in with very light copper hammer use. The BB shell on the new frame was a gnat's wider so when the cranks went back in, the spacer had just a little movement in it before the spindle went through, so next time they come off, I will be able to knock them out easily. The bearings are now flush within the cups, the cups are flush to the frame. All good.  :daumenhoch:
Is it your cup or bearing that is proud? If it is a bearing then your spacer tube is too long. Take a little off (the amount that the bearing is proud) using file or grinder.

john4130:
the bearing should sit a little proud on the non drive side about 1 or 2mm, if they sit flush then the tube spacer wont be tight against the bearings and will bind a bit wearing them out a bit quicker.

rick1970:
thanks nosepick  :daumenhoch:  great reply and probably for the amount of time i'll ride it ,is the best option cheers  :)

john thanks for that will do   ;) non drive side non drive side !!   :LolLolLolLol:  cheers ..

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