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For most zero-turn mowers today, steering is simply changing the speeds of the drive tires, a method called differential steering. The tire speed is controlled by two levers that protrude on either side of the driver and typically extend over the lap (aka. lap bars). It is not that different from steering a shopping cart. [5]
A wheelspin occurs when the force delivered to the tire tread exceeds that of available tread-to-surface friction and one or more tires lose traction.This leads the wheels to "spin" and causes the driver to lose control over the tires that no longer have grip on the road surface.
The term scrub radius derives from the fact that either in the positive or negative mode, the tire does not turn on its centerline (it scrubs the road in a turn) and due to the increased friction, more effort is needed to turn the wheel. Large positive values of scrub radius, 4 inches/100 mm or so, were used in cars for many years.
A non-zero slip angle arises because of deformation in the tire carcass and tread. As the tire rotates, the friction between the contact patch and the road results in individual tread 'elements' (finite sections of tread) remaining stationary with respect to the road. If a side-slip velocity u is introduced, the contact patch will be deformed ...
Depending on suspension design, a minor negative camber setting may slightly improve tire wear, as during turns the vehicle's center of gravity shifts toward the outside of the outer wheel. On a vehicle with zero camber this places load on the outboard shoulder of the tire, causing uneven wear over time.
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Diagram showing the path of a driver performing a U-turn.A vehicle with a smaller turning diameter will be able to perform a sharper U-turn. The turning radius (alternatively, turning diameter or turning circle) of a vehicle defines the minimum dimension (typically the radius or diameter) of available space required for that vehicle to make a semi-circular U-turn without skidding.
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