so, 2007 DL1000, 15,000 miles. relatively new tires, chain adjusted and rear sprocket appears to be in decent shape. Richland Rick spacer in place. every so often, as i'm starting off from a stop, i hear a clunking noise from the rear. not 100% sure, cuz it may be my mind playing tricks, but i can almost feel the thud through the seat. mind you, i ride conservatively, so my starts are gentle.