Yes, there is a lot written on another forum about the first couple of years of Stroms that had the rear wheel (yes, the whole thing) was about 2 millimeters off (to the left, I believe) becasue of a design flaw in the bushings. This made the chain off center between sprockets, and as a result - besides a terrible premature wear to the drive line - also completely distroyed the cushions as well. An outift in Germany makes a slick repalacement bushing that property recentered things for the Stroms that had this problem. The point was, it's not just the chain/sprockets that suffered, but also the cushes. Something to consider the next time you change out your chain and sprockets... check those cushes. Worn cushes can and will make all sorts of funny vibrations and harmonics, espeically at speed.