So far, it seems as though only internal hubs have the belts. Also it looks like the frame stay or drop out is made in two pieces so you can load the belt since the belt is one piece. This is not the best for frame stiffness but is fine for casual riding. I think the belt is fine for this type of riding. For off road, a belt exposed is not going to work since pebbles and dirt will get into the cogs and ruin the belt in a hurry. Belts have their place for sure and are better in some applications. But not all. And..I am not sure about this one.. Again. I think that Casual parking lot or path riding is ok. These belts have been around for decades now. If belts were the best, then..... Why don't the racers use it? I rest my case... Enjoy the ride...