on any road bumps etc., almost to the point in which they are annoying. If you live in an area where there are totally smooth roads with the occasional bump/pavement abnormality, they are a great buy for the price. However, if you deal with roads that are worn down, these are NOT the suspension setup for you. I ride on these coilovers 3-4 days a week through Manhattan/Queens on the way to school and back, and it is ABSOLUTELY brutal. I ride in the passenger seat, and my head is thrown against the headrest quite violently when a bump is hit.