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(TA771-0811) Rumbling noise from tires

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Bulletin Nbr: TA771-0811
Date: ........... April 2008
Market: All
Rumbling noise from tires

VEHICLES CONCERNED

All Saab 9-3 equipped with Good Year NCT5 16"

BACKGROUND

Customer complains on rumbling noise from tires.

CONDITIONS

This type of tread pattern in combination with unfavourable tire pressure and differing driving behaviour may contribute to the noise.

SYMPTOM DESCRIPTION

Abnormal toe-heel wear creates a rumbling noise that emanates from the rear (non-driven) axle.

ACTION

Check steering geometry and wheel alignment and tyre wear.

Moderate wear:


1. Change wheel/tyre from rear to front.

2. Raise the tyre pressure to 2.6 bar(38 psi).

3. Advise customer to use this raised pressure for these tyres (Good Year NCT5) in the future.


Heavy wear:


1. Change to another brand of tyres.

2. Follow the stated tyre pressure recommendations in the Owner's Manual.


If the customer insists on using Good Year NCT5 16" or at a first-time buy:


1. 1. Change the tyres.

2. 2. Inflate tyres to 2.6 bar(38 psi).

3. Advise customer to use this raised pressure for these tires in the future.