Thanks for the info.
But what I really am wondering abount is if the board is to wide for my riding.
My weight is 90 kG.
Only lightwind boards are this wide.
There are a couple of factors to consider. What is the typical wind strength where you do most of your riding? Are you going to ride with boots? If so, then typically, wider is a better choice. Your kites, water conditions(flat vs choppy) all play into the size you should select.
At your weight, depending on the answers to the above, a 44 or the 42 Supershinn would be the choice. I have ridden the 136 x 42 Supershinn (88kg) and found the performance excellent. I also finding a wider board can get you on smaller kite when the conditions are not quite full on.
On the weekend I was riding the Shinn Speedball (47.5cm W) and a Slingshot Darko 142(43.6 cm W) in around 20 knots on a 10m having lots of fun. I like wider boards, faster planing, great pop, solid landing platform. Good luck with your choice.