well i guess i'm breaking the rules since i only have one weight and height but i ride boards between 55 and 66. your weight ranges are out to lunch in that post, most manufacturers even if they list a recommended weight are 50 to 80 pounds or more in range, not 145-165 or whatever you first said. i am easily over the recommended weight range on most of the boards i ride. the size of board you ride is based on the type of riding you do and personal preference, not height and weight. again, 90% of the boards sold are in a 10 cm range, and riders weights vary to a much larger degree, you can't really screw up your board size very easily. whos to say a guy on a 56 should be on a 158? its not like the guy on the 156 just can't even snowboard because hes not on a 58. once he tries a 58 he may realize he prefers the extra length, but its not like hes going to look back at all his time on the 56 and regret every day of it.