Whether you drive on- or off-road, ride height is an important aspect of suspension setup. While raising ride height can increase traction, running too high can excessively raise the center of gravity and degrade handling. A lower setup is often stable and predictable, but too low with scrub speed if the chassis scrapes the ground too much. A RC car set too low can also cause odd, erratic handling as it occasionally hits the ground.
The easiest way to see if your vehicles is too low is to mark the chassis fairly lightly with a white china marker. These soft pencils can be found at most office supply stores.
Mark the bottom of your chassis in four spots–short lines front and rear and long marks on each side. This tip works on everything from a short course truck to a pan car.