Do you mean hitting a bump while full turn at low-mid speed, or just bumps in general? I'm mostly concerned with expansion joints at freeway speeds or under hard cornering.I have 235/45-27 on the 17' Goals and it rubbed once in a while i.e. making a 90% turn at a stop light at driving speed and hitting a bump > but nothing big. Got the size for the extra safely (aka rubber between pothole and rim).