I have a new Rize 4 also and love it, in fact I just got back from riding last week in Colorado and Utah. These bikes are really nice handling and comfortable and have a really solid feel, almost like a dirt bike the way they track over bumps, which I attribute to the longer travel suspension and HD frame design. My Medium size Rize 4 (aluminum frame) weighs 29 lbs, about a pound and a half more than a comparable Stumpjumper FS.