To the poster who asked why do 2x.
Rohloff specifies 2X for larger diameter wheels and 1X for smaller ones due to the design of their hub where there are bosses on one spoke flange for bolts that hold things together. So does NuVinci for their hub which is almost 6" in diameter at the spoke holes in the flanges.
Very little difference in strength between 2x, 3x, and 4x wheel construction per Jobst Brandt and 2x should save a few grams of weight.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/