The larger the spacer, the larger the leverage becomes. Secondly, installing wheel spacers on a car increases the leverage on the wheel bearing. This is where a scrubbing action occurs on both front tyres in opposite directions which can create unpredictable handling in corners and can lead to understeer too. This is the worst position for it to be in. The outward movement of the wheel can make a negative scrub radius become zero. If your car has the more favourable set up of negative scrub radius then installing a wheel spacer can cause bigger issues. An increase in positive scrub radius also causes the wheel to gain positive camber when the wheels are being turned, reducing grip in corners on the front wheels and producing understeer. Twitching wheels when braking can cause the tyre to lose grip and ultimately can cause the wheels to lock up and slide. Any bumps in the road will also be amplified through the steering wheel, making the steering jerky and more unpredictable. An increase in positive scrub radius increases the forces on the steering rack under braking conditions. If your car already has a bit of positive scrub radius then the wheel spacer will increase it. Fitting a wheel spacer will increase the positive scrub radius at the front wheels which has some unfavourable consequences. It is important to know whether your car currently has negative or positive scrub radius and ideally how much it has. Therefore, fitting a wheel spacer moves the wheel outboard and alters the scrub radius of the car. In particular, the king pin inclination axis remains in the same place. The main issue with a wheel spacer is that it moves the wheel to a wider position whilst the rest of the suspension arms remain in the same place. However, they are also a fast and easy way to ruin the geometry of your car and can badly affect your handling. They are a cheap and easy way to improve wheel fitment and increase the track width of your car. Installing wheels spacers is common within the tuning scene. Suspension Secrets Porsche GT Circuit Handling Pack Development.Suspension Secrets M3ATER Build – Part 2.Suspension Secrets M3ATER Build – Part 1.Porsche 930 Flatnose – Improving an Icon.
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Dallara World Series Single Seater – Under The Skin.Budget to Premium Coilovers – Whats The Real Difference?.2022 Porsche Cayman GT4 RS Suspension Overview.Calculating Ideal Spring and Roll Bar Rates Part 2.Calculating Ideal Spring and Roll Bar Rates.Tyre Performance and Grip – A Deeper Look.Tyre Failure – Graining, Tearing, Blistering and Wearing.Coilovers – Correct Ride Height Setting.The fundamental categories of suspension geometry are: Ackermann Bump Steer Camber Camber Gain Caster Front View Swing Arm Fundamentals of Grip Instantaneous Centre King Pin Inclination Scrub Radius Toe Tyre Slip Angle There are more aspects to suspension geometry but the most influential are listed above and are the focus of this website.
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