BBSHD needle bearing play

[sysrq]

Seems like some BBSHD batches have no play in needle bearing at all while others have more.

After replacing the needle bearing with SKF and using new spare axle there is more play than even before for some reason.

Not a credible source but according to chatGTP SKF needle bearings can wear out machined axle faster than some of the Chinese bearings due to mismatched hardness.

I thought all general purpose standard needle bearings are supposed to be the same hardness for interchangeability.

 

[amberwolf]

I thought all general purpose standard needle bearings are supposed to be the same hardness for interchangeability.

If a company follows standards, that would probably be true.

I doubt that the companies making most of hte parts we see on ebikes and ebike motors, kits, etc. are even consistent between batches of parts for materials and processes and machining tolerances used, much less following a specific standard correctly.