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The point where the steering axis line contacts the road is the fulcrum pivot point on which the tire is turned. Scrub radius is changed whenever there is a change in wheel offset. For example, when the wheels are pushed out from the body of the car the scrub radius becomes more positive.
The front and rear wheels will have different tire sizes; In case of improper installation the large rear wheel may rub suspension or wheel arches. Another setup option of staggered wheel fitment is called double staggered, having smaller diameter narrow width wheels in the front with larger diameter and wider width wheel in the back.
The wheel arch shape was slightly changed to prevent the rear tyres from rubbing when the suspension was compressed. To improve long-term durability, the thickness of the body sheet metal was increased from 1.2 mm to 1.5 mm and the suspension and gearbox mounting points were made from tubing with a greater wall thickness.
Tire uniformity refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards and test conditions accepted by global tire and car makers. These standards include the parameters of radial force variation , lateral force variation , conicity, ply steer, radial run-out , lateral run-out , and ...
For a real-world tire, the circle is likely to be closer to an ellipse, with the y axis slightly longer than the x axis.) In the example, the tire is generating a component of force in the x direction ( F x ) which, when transferred to the vehicle's chassis via the suspension system in combination with similar forces from the other tires, will ...
If the tire is not checked, it has the potential to cause vibration in the suspension of the vehicle on which it is mounted. In tire retail shops, tire/wheel assemblies are checked on a spin-balancer, which determines the amount and angle of unbalance. Balance weights are then fitted to the outer and inner flanges of the wheel. [2]
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Figure 1 Hard wheel rolling on and deforming a soft surface, resulting in the reaction force R from the surface having a component that opposes the motion. (W is some vertical load on the axle, F is some towing force applied to the axle, r is the wheel radius, and both friction with the ground and friction at the axle are assumed to be negligible and so are not shown.