I have put a new belt on and noticed some of the surface on the smooth side coming off. The belt seems ok otherwise but I wondered if the pulley had some roughness on it causing this. I checked pulley and it was smooth and tight when I replaced the belt, so I figured it was just natural for the new belt to shed the thin layer of rubber over the kevlar belt. My old belt was smooth on the back when I took it off. Also, since the belt comes off the pulley and the back sides are moving opposite to each other and are very close together, I wondered if slack was causing both sides to rub? I can see no evidence of this and the tensioner shock seems good. the debris is fine rubber particles and easily rubs off the back. I hope I am making sense in this description. Anyhow, have decided that if it continues, that I will have to consider changing out the shock, and pulley. What do you think?

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hlg