Hi folks, Haven't been riding the GS500 lately, as there's been a whirring sort of noise from the rear wheel (like a car tyre out of alignment - very rythmic and almost soothing ), which you can feel through the seat. It's not horrible, but I know it isn't right. So, first instinct was chain out of alignment/incorrect tension. Checked the tension, and found I had tightened it based on a loose link, rather than the tight spot in the chain - loosened it off a little and voila, no change in the noise. Damn. So, next thought was wheel bearing. Pulled the wheel off tonight, bearing seems to spin pretty smoothly. Then i found this; No, my sprocket doesn't have measles! I happened to grab the wheel by the sprocket at those points to move it, and found I could cause a shift in the sprocket alignment (relative to the centre of the wheel) with very little effort. The red circled area is where the movement shows - the silver section shifts about 5mm in and out of the centre of the wheel. So - my question, what causes this? Is it normal to have that sort of play, or is it a bearing/something else entirely??? Thanks for any assistance or suggestions... Jared.