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A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The main use of bearings is to support a rotating shaft. There are several types of bearings, with different principles and rolling elements, for example: Ball bearing and roller bearing.

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Can ball bearings pop out of housings?

The rear axle is split into two drive axles both of which are supported on a set of a couple ball bearings mounted to the frame with housings like the following: I probably should have gotten roller bearings … I'm mainly concerned because the bearings were quite easy to rotate (axially?) …
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