I have a slight vibration coming up through the handlebars from the front wheel when riding in a straight line, mostly at 40 mph and faster. Lean either way and it goes away. I had a badly warped rotor and had both replaced about 2,000 miles ago. I read the threads on warped rotors and about cleaning the calipers and pistons and might give that a try. Has anyone else experienced this vibration? Its slight and more noticable on very smooth road surfaces. All comments are appreciated. Thanks.