Hi Bidello,

For the W1100 in waves definitely the 82cm.  The extra length will give you more clearance for the wingtips when carving. 

I have tried giving the 91 a chance with the W1100, but I just do not like it.  It is way to flexible for me.  I really need to change my riding style to make it work.  I much prefer the 82.

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Gunnar