I am riding the 3DS 139 bio and really like it compared to the tfd 136 bio. For the 3DS they made the tip/tale wider and changed the tip/tale shape, narrowed the center of the board, this makes the board faster in the water. also the step down rails are more aggressive, as well as some new stableizer fins, and a new channel that goes into the board near the fins. I also really like that they changed the sizes and added another size
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