I don't understand why its so important to have an alluminum frame. If you look at the weight specs of all bikes, KTM'S are always on the lighter side even though they still use steel. Alluminum may be stiffer, but it is far less durable than chromoly, and tougher to repair. Also, because its not as strong as steel, more of it is needed to accomplish the same task, and that is why Honda's alluminum frame is chunky and covers everything. I doubt Yamaha engineers really wanted to go the Alluminum route, but are being forced to because the CRF's are so popular and the consumers want trick looking Honda-like frames. As for the stiffness issue, I doubt all but the greatest riders who ride their bikes to the absolute limit would notice the differences in stiffness between the current YZF frames and the 06's or 07's, whenever they come. And do most riders really need so much stiffness? That is one of the nice things about chromoly, it is forgiving. Who needs to be beat up and the end of the day? However, none of us would complain about less weight. If, at the end of the day, the next bike is 10 pounds lighter, I guess alluminum would be nice. If I had it my way, a lighter steel frame would be better, but I guess the current fad won't allow that.