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.
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.