SSM73928 Service Bulletin/Repair Instructions

7/9/2018
SSM73928 - Low Speed Manoeuvering Front Tyre Skip / Jump phenomenon | TOPIx
Reference
SSM73928
Models
Discovery / L462

Discovery Sport / L550

Range Rover / L405

Range Rover Evoque / L538

Range Rover Sport / L494

Range Rover Velar / L560
Title
Low Speed Manoeuvering Front Tyre Skip / Jump phenomenon
Category
Chassis
Last modified
09-Jul-2018 00:00:00
Symptom
306000 Tyres/Wheels
Attachments
Picture 1.pdf
Content
Issue: Low Speed Manoeuvring Front Tyre Skipping Phenomenon

Cause: Acute Ackerman angles employed to enhance driving

experience

Action:This SSM is a guide to explain the phenomenon of front tyre

skipping while low speed manoeuvring with full lock applied to the

steering causing a feeling of a slight jump, vibration or noise from the

front tyres.

This is NOT an error state. It is a result of geometry focused for

higher dynamic higher cornering speeds, manoeuver, environment

and tyre type.

Geometry

100% Ackermann Geometry principle means that front lock angles

allow for the radius of travel of both wheels to be defined by a

common point through the rear axle. However in reality this principle

cannot be achieved due to inner wheel lock angle constraints.

Typically, vehicles have Full Lock Ackermann levels between 55 and

65%. More sports orientated vehicles have lower levels of

Ackermann specifically to improve tyre utilisation.

Manoeuver

A benefit of low Ackermann can be found at higher cornering speeds

when the tyres are generating slip angles. At very low speeds the

tyres do not generate a slip angle which results in an aligning torque

being applied to the tyres that is absorbed in the tyre. Tyre slip is
https://topix.jaguar.jlrext.com/topix/content/document/view?id=905626
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7/9/2018
SSM73928 - Low Speed Manoeuvering Front Tyre Skip / Jump phenomenon | TOPIx
exaggerated at high lock angles.

Environment

Tyre slip is more perceptible when the friction level between road and

tyre is lower, I.e. when there is ice and snow, or when the road

surface is wet. Or Brick, car park painted surfaces or concrete

containing pea shingle may exacerbate the concern.

Tyre Selection

Changing the tyres from summer to all season or winter tyres may

result in an improvement but there is a trade off in economy, road

noise and tyre life. A customer experiencing this phenomenon can

choose to fit an alternative tyre at their own expense.

A benefit of low Ackermann can be found at higher cornering speeds

when the tyres are generating slip angles (represented in picture 1 by

the green arrows).

More sports orientated vehicles have these lower levels of

Ackermann specifically to improve tyre utilisation.
Technicians - Please rate this SSM and provide comments so that

future communications can be improved.

1 = Poor – Basic information provided – The SSM does not help me

resolve the customer concern.

3 = Average – Adequate information provided – The SSM partially

helps me resolve the customer concern.

5 = Excellent – All required information provided to resolve the

customer concern.
https://topix.jaguar.jlrext.com/topix/content/document/view?id=905626
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