Where/how a bike carries its weight matters. I ride a KTM 450 XCRW that is much heavier on paper then my off-roaded CRF450R and it sure doesn't feel like it when riding. And, nothing is going to make up for lack of fitness and fine bike control. I've ridded with guys on XR650R on fairly tight trails that I had to work to keep up. 260lb with 1/2 tank isn't heavy in my book for a 450 4T.