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a. Ply steer - Ply steer is an inherent characteristic in a tire which results in a lateral force as the tire
rolls. Rotating the tires from side to side may aid
in cancelling out the effects of ply steer and can aid in diagnosing a ply steer concern.
b. Conicity - Tire conicity refers to the shape of the tire and how cone shaped it is. This can
influence vehicle drift or pull. Conicity can be present in
a new tire due to manufacturing, or in a used tire due to camber wear. Rotating tires may reduce a
vehicle pull concern due to tire conicity.
4. Road Crown - Road Crown is the slope of a road surface to ensure proper drainage. Excessive
Road Crown can cause a vehicle to drift to the low
side of the crown.
5. Cross Wind - Excessive cross winds can cause a vehicle to pull or drift. If the Winds are
excessive it can skew the test results.
Other issues can cause vehicle drift or pull, such as brake drag, spring sag resulting in ride height
differences, cargo load/weight distribution, and more. It is important to consider all potential effects
when diagnosing and confirming a vehicle drift or pull condition. Understanding the factors that
affect vehicle drift or pull can help to determine the root cause.
HOW TO DETERMINE VEHICLE DRIFT OR PULL
To confirm a vehicle drift or pull, use the following procedure:
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