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2. Scrub radius - Wikipedia

   en.wikipedia.org/wiki/Scrub_radius

   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. Older cars tended to have very close to zero scrub radius but often on the positive side, while newer cars with ABS tend to have a negative scrub radius (this is why ...

3. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   A positive offset means the hub-mounting surface is closer to the outside edge of the wheel, while a negative offset means the hub-mounting surface is closer to the inside edge of the wheel. A wheel with too much negative offset will be closer to the edge of the fender. This can cause clearance issues between the tire and the fender.

4. Wheel arrangement - Wikipedia

   en.wikipedia.org/wiki/Wheel_arrangement

   Especially in steam days, wheel arrangement was an important attribute of a locomotive because there were many different types of layout adopted, each wheel being optimised for a different use (often with only some being actually "driven"). Modern diesel and electric locomotives are much more uniform, usually with all axles driven.

5. Slip (vehicle dynamics) - Wikipedia

   en.wikipedia.org/wiki/Slip_(vehicle_dynamics)

   In (automotive) vehicle dynamics, slip is the relative motion between a tire and the road surface it is moving on. This slip can be generated either by the tire's rotational speed being greater or less than the free-rolling speed (usually described as percent slip), or by the tire's plane of rotation being at an angle to its direction of motion (referred to as slip angle).

6. Tire balance - Wikipedia

   en.wikipedia.org/wiki/Tire_balance

   If a principal axis of the wheel's moment of inertia is not aligned with the axle, due to an asymmetric mass distribution, then an external torque, perpendicular to the axle, is necessary to force the wheel to rotate about the axle. This additional torque must be provided by the axle and its orientation rotates continuously with the wheel.

7. Slip ratio - Wikipedia

   en.wikipedia.org/wiki/Slip_ratio

   Slip ratio is a means of calculating and expressing the slipping behavior of the wheel of an automobile.It is of fundamental importance in the field of vehicle dynamics, as it allows to understand the relationship between the deformation of the tire and the longitudinal forces (i.e. the forces responsible for forward acceleration and braking) acting upon it.