Last night I loosened my chain up about 1 turn on the adjuster bolts. I recently had adjusted it to the factory specs, per both the factory manual and haynes book instructions, 25-30mm on the center stand. I weigh 210 lbs., and I have noticed that I was hearing a rumbling sort of noise when in motion, and I assumed it might be the chain. My daughter helped me measure it last night with me on board, and I adjusted it between the 25 - 30mm with me on it. Once that was set, I remeasured it on the center stand unladen, and it was something like 40mm. I'm going to ride it like this for awhile and then I'll post back any feedback.