How Does Reducing Race Car Weight Change race car Bearing Requirements?
Maintaining bearing performance without increasing weight is critical.
Making a race car lighter sounds like it should make life easier for its bearings but race car bearing requirements can change according to various major factors.
With a lighter car there is less mass to accelerate, stop and throw around a corner. Therefore, the loads should fall and smaller bearings should be able to do the job.
Unfortunately, race car engineering is rarely that considerate.
Reducing weight can lower some loads. However, it can also leave engineers with less space, less material and a smaller safety margin. At the same time, the car must still handle aggressive braking, high cornering forces, drivetrain torque, vibration and repeated impacts.
The result is not simply a search for the lightest bearing available. It is a much broader question:
How can the bearing deliver the required load capacity, stiffness and reliability without adding unnecessary weight?
In 30 Seconds
Reducing the weight of a race car does not automatically make bearing selection easier.
A lighter and more compact car may still produce high loads through braking, cornering, aerodynamic forces and drivetrain torque. Engineers may also have less room for the bearing, its housing and its lubrication system.
The chosen bearing must balance:
- Load capacity
- Stiffness
- Friction
- Speed
- Temperature
- Internal clearance
- Lubrication
- Sealing
- Size and weight
- Expected service life
A smaller bearing is not always the better bearing. The aim is to improve the performance of the complete assembly.
Key Takeaways
- Vehicle weight is only one source of bearing load.
- Smaller packaging can increase the load carried within a limited space.
- Bearing stiffness can be as important as maximum load capacity.
- Lower friction must be balanced against lubrication and protection.
- Heat can change bearing clearance and operating behaviour.
- Different parts of a race car require different bearing designs.
- The lightest individual component may not create the lightest complete system.
Why Is Race Car Weight Such a Major Talking Point?
Weight affects almost every part of race car performance.
A lighter car can accelerate more quickly, respond faster to steering inputs and require less energy under braking. Reducing unsprung mass can also help the suspension control the wheel more effectively.
That explains why the 2026 Formula 1 regulations targeted cars that were shorter, narrower and around 30kg lighter than the previous generation.
However, removing weight from a race car is not a case of trimming every component by the same percentage.
Some parts can be reduced relatively easily. Others must continue to withstand demanding loads. Bearings fall firmly into the second group.
Why Doesn’t a Lighter Car Always Mean Lower Bearing Loads?
The weight of the vehicle contributes to bearing load, but it is only one part of the calculation.
Bearings in a race car may also experience forces created by:
- Aerodynamic downforce
- Heavy braking
- Rapid acceleration
- High cornering speeds
- Drivetrain torque
- Kerbs, bumps and surface changes
- Tyre grip
- Vibration and shock
- Misalignment between connected components
Some of these loads are steady. Others change direction or arrive as sudden impacts.
A suspension bearing, for example, may need to articulate while handling changing loads from braking, steering and the track surface. A gearbox bearing may operate at high speed while supporting forces created by gear engagement.
Reducing the car’s static weight does not remove these demands.
In some cases, better tyres, stronger braking performance or improved aerodynamic efficiency can maintain high operating loads even when the car itself becomes lighter.
Why Does Tighter Packaging Make Bearing Selection Harder?
Weight reduction often goes hand in hand with smaller components and tighter packaging.
This creates a difficult engineering trade-off. The bearing may have less space available while still needing to provide adequate load capacity and stiffness.
Reducing a bearing’s dimensions can affect:
- The size and number of rolling elements
- Contact area
- Load capacity
- Rigidity
- Heat dissipation
- Lubricant capacity
- Fatigue life
This is why the type of bearing matters as much as its external dimensions.
Needle roller bearings are a good example. Their long, narrow rollers can provide high radial load capacity within a relatively small radial space. Manufacturer guidance from IKO describes machined needle roller bearings as combining low sectional height with large load ratings and a rigid outer ring.
That makes them useful where space is restricted. However, their suitability still depends on speed, alignment, lubrication and the direction of the load.
Compact does not mean universal.
What Happens If Bearing Stiffness Is Reduced?
A bearing does more than support a load. It must also control movement.
If the bearing or its surrounding structure deflects too much, the position of the connected components can change.
Depending on the application, this may affect:
- Wheel alignment
- Suspension geometry
- Steering response
- Gear mesh
- Brake disc position
- Sensor accuracy
- Driver feedback
This is why engineers cannot consider bearing weight in isolation.
A very light bearing may require a larger or heavier housing to maintain stiffness. It may also reduce the accuracy of the complete assembly.
The best solution is normally the lightest system that achieves the required performance. That includes the bearing, shaft, housing, fasteners and lubrication arrangement.
Can Engineers Simply Use a Lower-Friction Bearing?
Reducing friction can improve efficiency and limit heat generation. Both are valuable in motorsport.
However, friction is affected by much more than the bearing type.
It can also be influenced by:
- Seal design
- Lubricant viscosity
- Lubricant quantity
- Bearing preload
- Internal clearance
- Rolling-element contact
- Operating speed
- Temperature
- Contamination
Removing a seal may reduce drag, but it also leaves the bearing more exposed. Using less lubricant may reduce churning losses, but insufficient lubrication can increase wear and heat.
Even excess grease can create resistance until it has been redistributed within the bearing. This is one reason lubrication quantities and procedures should be based on the actual application.
The sensible target is controlled friction, not simply the lowest possible figure.
How Do Temperature and Clearance Affect a Race Car Bearing?
Bearings, shafts and housings expand as they become hotter. They may also expand at different rates if they use different materials.
This can change the bearing’s internal clearance while the car is running.
If the operating clearance becomes too small, friction and temperature can rise. If it becomes too large, the assembly may lose stiffness and positional accuracy.
Schaeffler’s bearing mounting guidance notes that high loads and high speeds increase bearing temperature. The resulting thermal expansion can change the clearance set during installation.
Engineers must therefore consider operating conditions rather than relying only on a bearing’s dimensions at room temperature.
This becomes particularly important when lightweight aluminium housings are used around steel bearings and shafts.
Which Bearings Are Used Around a Race Car?
There is no single “race car bearing”. Different systems create different loads and movements.
Suspension and Steering
Suspension and steering systems may use spherical plain bearings and rod ends where articulation or misalignment must be accommodated.
PTFE-lined versions can provide low-friction movement without regular grease application. However, liner type, load, movement and environment must all be considered.
ABC Bearings supplies a range of rod ends and spherical bearings, including specialist NMB E-Liner rod ends.
Read our Next article: Why Do Motorsport Suspension Systems Use Spherical Bearings and Rod Ends?
Wheels and Hubs
Wheel bearing arrangements must support radial and axial loads while controlling wheel movement.
Depending on the hub design, this may involve angular contact ball bearings, tapered roller bearings or a purpose-built wheel bearing unit.
Correct fit, clearance and preload can be just as important as the bearing’s quoted load rating.
Read our Related article: What Happens to Wheel Bearings Under Race Conditions?
Gearboxes and Transmissions
Gearboxes contain several bearing applications within a restricted space.
Needle roller bearings can be useful where high radial capacity is required without a large outside diameter. Ball and roller bearings may also be selected to support combined loads, locate shafts or handle higher speeds.
ABC offers machined needle roller bearings for compact, high-load applications.
Read our Related article: Why Are Needle Roller Bearings Used in Motorsport Gearboxes?
Pumps, Motors and Auxiliary Systems
Pumps, electric motors and control systems may use ball bearings or miniature bearings.
Here, speed, temperature, cleanliness and lubricant choice may be more important than shock resistance.
ABC’s ball bearing range includes deep-groove, angular-contact, thrust and self-aligning designs.
What Should Engineers Consider When Reducing Bearing Weight?
Before selecting a smaller or lighter bearing, engineers should consider:
- What are the maximum radial and axial loads?
- Are the loads steady, reversing or shock-based?
- What operating speeds will the bearing experience?
- How much space is available?
- How much deflection can the system tolerate?
- Does the bearing need to accommodate misalignment?
- What temperatures will the bearing, shaft and housing reach?
- How will the bearing be lubricated?
- Does it need protection from dirt, water or debris?
- How will it be mounted and inspected?
- What service life is required?
- Can it be replaced between events, or must it last a full season?
There is rarely one figure that provides the answer.
Bearing selection is a balance between the complete set of operating conditions.
Is the Lightest Bearing Always the Best Choice?
No.
A bearing that saves a few grams may require a stronger housing, more frequent replacement or a reduction in performance elsewhere.
It may also create additional heat, movement or maintenance work.
Motorsport engineers are interested in useful weight reduction. That means removing mass without creating a larger problem.
The best bearing is the one that delivers the required performance at the lowest sensible system weight. Sometimes that means a smaller bearing. Sometimes it means using a different bearing design.
Occasionally, it means accepting a few extra grams because finishing the race remains rather important.
How Can ABC Bearings Help?
Choosing a bearing for a compact, high-load or high-speed application involves more than matching bore and outside diameter.
ABC Bearings supplies bearing products for motorsport, automotive and demanding engineering applications. The range includes:
For specialist requirements, ABC can also provide technical support with bearing selection, lubrication and application requirements.
CONTACT US: Talk to ABC Bearings about your motorsport bearing application.
What Should You Read Next?
Weight reduction is only the start of the discussion.
The next article in this series looks more closely at suspension movement, misalignment and load:
Why Do Motorsport Suspension Systems Use Spherical Bearings and Rod Ends?
You can also return to the Formula 1 Fan Hub for circuit guides, technical features and more from the 2026 season.