The 583 riders don't need a 620 to enter class A anyway.
So we could have a grid of 25 x 583's and 44 x 620/583
Hopefully I'll be up front somewhere so it doesn't affect me.
I can see it being an issue when 583 riders start to muck up the 620 riders' races, much in the same way that 583 riders get upset when they have to combine with 620's. It swings both ways.
[Edited on 16-5-2006 by domski]