Make of cassette is shimano 4600, if the wheel only goes up to 10 speed why would it need a spacer, i thought you only need spacers running 10 speed with a 11 speed hub, please enlighten me on that one, its is also tightened up, there is is no play in the cassette, except for i can feel a bit of play in the freehub going in a up and down movement.
