I have a 2006 WR250F with the steel frame. I like the look and feel of the bike and it's a great trail bike. I'm thinking about adding a 450F to my stable of bikes for some of the more open and faster rides that we do. Is there any significant weight difference or "feeling" difference between the alum and steel frame WR450F's? I do like the "old school" look of the steel frames and I appreciate the access to the carb. However, I think weight may be the deciding factor for my choice. Did the 450's switch to the alum frame in '07 like the 250's? Does anyone know what the difference in weight is between a WR250F and a WR450F? I just noticed I put this in the YZ forum. Did'nt realize there was a separate forum for WR's. I would still appreciate input from YZ riders on the frame differences.