![]() Excessive bump steer increases tire wear and makes the vehicle more difficult to handle on rough roads. If both wheels on a live axle move upwards by the same amount, they tend not to steer.īump steer causes a vehicle to turn itself when one wheel hits a bump or falls down into a hole or rut. ![]() Cars with rear live axles, also known as solid axles do not exhibit true bump steer, but can still cause some steering over one wheel bumps, see § difference between bump steer and roll steer. They can also be designed to have very little or no bump steer at all. Many modern vehicles have rear suspension designs which are opposite of the front suspension: Toe in under bump, and out under droop. Rear suspension can be designed a number of ways. during a turn, body roll will cause the outside suspension (relative to the curve) to compress and the inside suspension to droop (extend). This is known as "toe out" under bump and results in roll understeer. On modern cars, the leading edge of the front tyres move outwards as the suspension is compressed, and inwards as the suspension droops (extends). On modern cars the front suspension and steering links are designed so that during a turning manoeuvre, body roll and suspension motions will not influence the car to turn more sharply than the driver anticipates. Difference between bump steer and roll steer.It is typically measured in degrees of steer per metre of upwards motion or degrees per foot. Steering input caused by axle oscillation of a tractorīump steer or roll steer is the term for the tendency of the wheel of a car to steer itself as it moves through the suspension stroke. ![]() JSTOR ( June 2018) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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