The ass end was wobbling, felt like it does when the wind is pushing you on the highway but back and forth slowly. Must have caught it riding through the construction zone. That was on a rear OEM Dunlop 190/50, but not OEM size for my model. Never bothered to check what tire size I was running when I bought the bike used from a dealer- only % tread and since then just the PSI once in a while. 190/50 D218 vs 180/55 Qualifier: Will I notice a difference?