TSB : Wheels - Retrofitting Unapproved 18 Inch Wheels

Details

Group 4 Number 9305 Model All Part Identifier 4412 Subject: Installation of 18" Wheels Not Approved April 15, 1993 ATTENTION: Service Manager/Service Technician Models Affected: All Concern: Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED. General Information: Endurance tests have shown that equipping certain Porsche vehicles with 18" wheels in an application not already approved by Porsche Cars, N.A. may result in loosened bolts and/or threaded connections on the front wheel carriers. This, in turn, may cause fractures in these components. Fractures may also occur in the front strut mounts and in the body in the area of the rear suspension as a result of the installation of 18" wheels not already approved for installation for this specific application. Such damage can occur without warning and the vehicle may become very hard to control or steer as a result of this improper installation. Porsche dealer personnel coming in contact with a vehicle that has been retrofitted with 18" wheels in an application not approved by Porsche, should inform the owner of the vehicle of the potential for damage to their vehicle and loss of steering control. Porsche Cars, N.A. should also be notified of any vehicles retrofitted with 18" wheels.