And completely pointless. This was a marketing gimmick to make them seem like the hi-lo set up of a hockey skate. On some models the front two axles had two positions so you could have 76 76 80 80 flat, or 80 80 80 80 flat. Either configuration gives you the same wheelbase, the same flat set up and the same flat boot. So you get none of the advantages of a true hi lo set up (short wheel base with large back wheels, forward lean, toes closer to the ground).
The ones with the option were further compromised by the feeble screw holding the "rockerable" axle in place.