Glossary “roll stiffness” Definition:
The resistance, measured in pounds per inch of spring travel, of a suspension system to the rolling of the vehicle’s mass.
What is roll?
roll centers
Glossary “roll centers” Definition:
The points at the front and rear about which the vehicle’s spring mass will roll.
roll out
Glossary “roll out” Definition:
The distance a race car travels in a drag-racing event at the beginning of a run before the front tires clear the stage beam and start the clock.
roll over valve
Glossary “roll over valve” Definition:
Valve in the vent line from the fuel tank that blocks the line if the vehicle is in an accident and rolls over, preventing liquid fuel from being able to leak out.
roll steer
Glossary “roll steer” Definition:
The direction and amount that the rear axle may cause the vehicle to steer as it moves through its travel when the body rolls during cornering requiring the driver to oversteer or understeer to compensate for the problem.
roll axis
Glossary “roll axis” Definition:
The longitudinal axis of a vehicle defined by an imaginary line running through the front and rear roll centers.
roll bar
Glossary “roll bar” Definition:
A tubular bar behind the cockpit of a race car to protect the driver in case of a rollover.
roll cage
Glossary “roll cage” Definition:
A tubular, cage-like structure surrounding the cockpit of a race car to protect the driver in case of a rollover and to add strength to the overall structure of the vehicle.
roll
Glossary “roll” Definition:
1). To turn over and over. 2). To tip or sway side-to-side. 3). The motion of a vehicle body toward the outside of a turn when cornering or changing directions suddenly.