What is a torsion bar?

A torsion bar is a type of suspension system used in vehicles that uses a long, cylindrical metal bar, usually made of steel, which is twisted along its axis to provide resistance to bending or twisting forces. The bar is anchored to the vehicle chassis at one end and to the suspension arm at the other end. As the wheel moves over a bump, the torsion bar twists, absorbing the shock and reducing the vibration transmitted to the vehicle.

One of the advantages of a torsion bar suspension system is that it is simpler and lighter than other types of suspension systems, making it ideal for smaller, lighter vehicles, particularly those designed for off-road use. Torsion bars are also tunable, meaning that the stiffness of the suspension can be adjusted by changing the diameter of the bar or adjusting the position of the anchor points.

However, torsion bar suspension systems can be more difficult to repair or replace than other types of suspension systems, primarily due to the location of the torsion bar within the vehicle. Additionally, they may have limited suspension travel and may not provide as smooth a ride as other suspension systems.