So we have mechanisms that create a very specific kind of resistance to suspension movement, called damping. Typically, these systems use oil—generally very light oil compared to what’s in the engine—forced through some kind of restriction. The amount of damping can be tailored depending on the size of the bump—meaning the displacement of the suspension component in question—as well as the sharpness of the bump. Quick hits such as those you experience rolling over sharp-edged pavement seams cause the suspension to move a small amount very quickly. Long-period disturbances, such as getting hard on the brakes, try to make the suspension move a lot but comparatively slowly. This is where we get the terms that define the speed of the suspension movement. When we say high-speed compression damping, we don’t mean the speed of the vehicle, just the velocity of the suspension part in question. Generally, high-speed damping influences ride quality—what we perceive as harshness or chattering—while low-speed damping helps control chassis pitch—what you feel during hard acceleration or braking, as well as the gradual loading the suspension receives during aggressive cornering.