The have wide tails for their size, but it also depends how you sail them. A friend of mine has used a 87 with an 8.0 for speedsailing. But that would be bad for slalom.
Also, some manufactures recommend the "ideal" sail sizes, while Isonics recommeds more what you can use. I dont think many would choose a isonic 107 as a "ideal" board when overpowered on a 5.8 racesail, or really underpowered on a 9.0.
It also depends on your weight, if you are 120kg you will use a 107 as a highwind board, and if you are 55kg it will rock as a lightwind board.
Last edited by kapten k; 25th April 2012 at 10:05 PM.