• Is the shoulder on a typical cartridge unit necessary?

    IMO, yes.

    I’ve never used a Phil bb so don’t know how well they work but at work (velodrome) I get kept fairly busy fixing bikes with the Miche bb that has no lips/shoulders. They tend to loosen off and move themselves to one side or the other.

  • Thanks, Real world knowledge!

    I think I will try with a lockring on the non-driveside cup then and see if it holds.

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