I'm looking at buying a first olympic barbell and am trying to understand how the sleeves allow the weight plates to rotate freely. Sleeves means the same as collars, right?
From what I know, the inner side of the barbell is built up where the weight plates rest against, just like in a standard barbell, to stop the weight plates sliding towards your hands, so why then is an inner sleeve necessary?
The outer sleeves are designed to rotate freely but I don't understand how this forces the weight plates rotate. If the collars are removed, won't the weight plates be allowed to rotate freely anyway?