Yes, I know what you mean, but track riders use smaller cogs so its doubtful that ISO 6-bolt will ever become a standard for track hubs. I use an ISO 6-bolt set up on my FG MTB, and it works fine. However, the beauty of the Level type hub is that the bolts are not subjected to shearing forces, unlike an ISO six bolt setup. This means you can use fewer and smaller bolts. Its stronger with fewer parts and less weight.