I own a 2015 200s, just over 100k miles on it. I bought it around 80k. this noise has been happening since then but not as frequent. I describe the noise as a clanking, clinking sound. it comes from the rear passenger wheel, and only occurs at low speeds (below 10mph). mostly when accelerating, like when pulling in or out of a parking lot, or from a stop sign. occurs both when going straight or turning, and is not correlated with bumps, it happens mostly on smooth roads. as far as i know has no correlation with shifting gears. no handling or driving issues. does not make noise or feeing inside car... but you can hear it loud and clear outside of car or if you have windows rolled down.