Why EV Steering and Suspension Components Need Greater Durability

Electric vehicles are changing more than vehicle powertrains. Their design characteristics also create different operating demands across safety-critical systems, including steering and suspension.

Increased vehicle mass, instant torque delivery and changing load patterns all contribute to higher stresses across components. As a result, durability becomes increasingly important in supporting long-term vehicle performance, steering precision and reliability.

Increased vehicle mass creates sustained loading

Battery systems are one of the largest contributors to overall EV weight.

Compared with many equivalent internal combustion vehicles, battery packs can increase vehicle mass by approximately 20–30%.

This additional weight creates sustained loading across steering and suspension systems during everyday driving.

Components managing these forces may include:

• Control arms

• Ball joints

• Steering linkages

• Tie rods

During normal vehicle operation, these components repeatedly absorb forces created by:

• Braking

• Acceleration

• Cornering

• Uneven road surfaces

Over time, repeated stress cycles can place increased demands on component durability.

Dynamic loads create additional stress

Electric motors can deliver peak torque immediately.

Unlike traditional power delivery which builds progressively through engine speed, electric drivetrains transfer force more directly through the vehicle.

This repeated loading and unloading can increase stress on steering and suspension joints.

Components designed to manage dynamic loading conditions need to maintain structural integrity while supporting consistent handling performance.

Material selection plays an important role

Durability is influenced not only by vehicle operating conditions, but also by component design and material construction.

Engineering approaches designed to support higher loading conditions may include:

Forged steel and forged aluminium construction

Forged materials can provide increased structural integrity and fatigue resistance under sustained loading conditions.

Heat-treated ball stud materials

Ball studs manufactured from SAE 5140 / 41Cr4 steel are engineered to deliver high tensile strength and wear resistance under dynamic operating conditions.

Advanced bearing materials

Bearing systems designed to manage vibration, radial loads and axial forces can help maintain steering precision throughout component life.

Real-world conditions add further challenges

Vehicle components rarely operate under controlled conditions alone.

Across UK roads, steering and suspension systems may also experience:

• Potholes

• Surface variability

• Moisture exposure

• Corrosion risks

• Frequent steering inputs in urban environments

These conditions can place further demands on durability and long-term component performance.

Supporting long-term vehicle performance

As electric vehicle adoption continues to grow, steering and suspension systems continue adapting to different operating requirements.

Durability remains an important factor in maintaining vehicle handling, ride quality and safety across modern EV platforms.

Understanding how EV operating characteristics affect component loading helps support engineering approaches designed for changing vehicle demands.