I found a 12 gauge spoke in a recycle bin. The threads were unable to fit through a shimano so I cut it in half. Surprise the elbow did fit in a shimano XT hub. So if someone were to build a 12/13 gauge spoke it would work. 13 gauge nipples have a flat of .156 inch 14 gauge spokes have a flat of .136 inch. A 13 gauge nipple will fit in Weinmann 519 rims. This rim is available in 48 holes now and it is tougher than anything Mavic makes. This company can roll 12 gauge spokes
http://holmeshobbies.com/product.php...0&bestseller=Y This company can swage spokes though they only do the larger motorcycle sizes
http://www.buchananspokes.net/categories/spokes.asp notice the prices. Notice also that single butted or single swaged spokes are standard for motorcycles. Stainless steel nipples are also standard. Santana uses a single butted spoke because many people would complain about the lack of stiffness of triple butted spokes. With 12 gauge spokes you can have your strenght and you can choose the stiffness you want. There is room for the 12/13 gauge the 12/14/13 triple butted spoke also. A wheel with 36 12 gauge spokes will be stronger than a wheel with 48 14 gauge spokes. It will be cheaper too. The shimano HF 07 hub uses the same parts as the shimano XT 750 but costs $80 more. This is a drop in replacement for standard wheels and if you do break a spoke you can use a 14 guage spoke as an emergency replacement.