CPR offers a complete in-house Suspension Geometry and Chassis Set-Up solution, for all Performance Sports Vehicles via our Snap-On SUN MAC 4 Wheel Alignment Lift Rig with Laser Heads. We specialise in aftermarket suspension coilover set-up and installation, 4 Wheel Alignment Geometry Adjustment and Vehicle Corner Weighting.

Suspension Geometry is a key setting and factor in the car's overall balance and dynamics in Fast Road, Sports or Competition application. Suspension Geometry is the relationship between the position of the wheel to the car body and will have the greatest effect in the way the car handles. Our experience over many years in owning, modifying and racing performance Front Wheel, Rear Wheel and 4 Wheel Drive will allow us to pass on our knowledge of the optimum settings for each respective vehicle in it's given environment. We like to offer our customers these highly researched settings as a starting point to your geometry setup, We encourage our customers to try our geometry settings for themselves, and pass judgement on the car's handling characteristics for their own driving style. Personal driving preference has a great deal of influence to the Suspension Geometry. For instance, some drivers prefer a car to oversteer (the rear end of the vehicle to try slide outwards on corners), some prefer the car to stay neutral or understeer before oversteer. All of these handling characteristics can be setup and tailored when we perform Suspension Geometry Adjustment.
Other key vehicle dynamics affected by Suspension Geometry can vary from Tyre Wear, Braking Stability, High-Speed Stability and Traction.

When we make Suspension Geometry Adjustment on your vehicle we will measure and adjust the following;

TOE.

  • The individual wheel toe angle A, is the angle of the wheel from the straight overhead.
  • The total toe is the sum of angles A and B.
  • Toe can be measured in Degree's & Minutes or mm. CPR measures in the former (60 Minutes per Degree)

  • The term 'toe-in' is used when the wheels are closer together at the front. 'Toe-in' or 'Positive Toe' on the front of the car will make the car harder to turn into a corner.
    For example when a car with toe-in on the front wheels is about to enter a left turn, The driver begins to turn the wheel left. The left-front wheel is pointing only slightly to the left while the right-front wheel is pointing much more to the left. The problem with this is that the left-front wheel needs to turn with a greater angle than the right-front wheel because the left-front wheel is on the inside of the corner and, therefore, must trace an arc with a smaller radius than the outside wheel. However, with toe-in, the left-front wheel is actually trying to trace a larger radius arc than the right-front wheel. It is difficult to make the car turn because the left-front wheel is fighting the right-front. When the car is already in the turn, weight transfers to the right-front wheel and diminishes the effect of the left-front wheel. Because of this weight transfer, toe mainly affects corner entry.

  • The term 'toe-out' is used when the wheels are closer together at the rear. With toe-out, the inside tire in a corner turns with a greater angle than the outside tire (as it should). This improves the grip of the front tires on corner entry.

  • In addition to corner-entry handling, toe affects straight-line stability. Toe-in improves stability while toe-out worsens stability. This can be explained through the same reasoning as was used to describe corner-entry handling. Toe-out encourages turn-in since the inside tire turns at a greater angle than the outside. Hence, the car is sensitive to the slightest steering input. Toe-out will make the car wander on the straightaways requiring corrective steering. The car will always be turning unless the steering is perfectly centered. With toe-in, the inside tire fights the outside since the inside is trying to trace a larger radius arc than the outside. As a result, toe-in discourages turn-in and makes the car less sensitive to steering input. In other words, it is more stable.

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