[toodles]

You know whats good about bearings? Standard sizes. You know whats frigging stupid - custom bearings.

Mate of mine asked for help changing the bearings in his BB. One bearing was a 6904 and labelled as such. BUT A CUSTOM 22mm ID SIZE. Why the hell label it a 6904???

 

[iRider]

You know whats good about bearings? Standard sizes. You know whats frigging stupid - custom bearings.

Mate of mine asked for help changing the bearings in his BB. One bearing was a 6904 and labelled as such. BUT A CUSTOM 22mm ID SIZE. Why the hell label it a 6904???

View attachment 226297

Isn't this just a pretty normal size for a Spanish BB with 22 mm axle?

 

[toodles]

Isn't this just a pretty normal size for a Spanish BB with 22 mm axle?

Yes but why not use 22379 bearing if that the dimensions. I've never seen a bearing labelled as one size with the dimensions of another.

 

[Leafy]

Yes but why not use 22379 bearing if that the dimensions. I've never seen a bearing labelled as one size with the dimensions of another.

Just the seal was labeled, maybe factory bom mix up or the seal was replaced after the fact?

 

[toodles]

Just the seal was labeled, maybe factory bom mix up or the seal was replaced after the fact?

Both sides were labelled as 6904. Bloody weird. I was trying to reinstall and the crank and it wouldn't fit haha. Total gongshow.

FWIW - this sort of shit is why I have Shimano cranks and BBs on all my bikes. I'm too stuck in my ways to learn anything more complicated about BB maintenance than "Remove old BB. Replace with new $40 BB. Jobs a good 'un"

 

[DaveW]

Thought that was pretty normal, I used to carry several different 6904's in stock at the bike shop (6802 was the other comon one that does this I think..... memories a bit rusty).