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The inside tread on the rear tires of Porsche 996 are "cupping" and causing a drumming sound. Is this a rear suspension problem? Car has 130,000 miles on it.

Answers from the Automotive Experts

Amanda J. Pierce, MBA Jim, This is more of an alignment and lack of rotation concern that causing cupping of tires. Standard intervals for rotation of tires should be every other oil change. At 130k it wouldn't hurt to get an alignment performed, if rear suspension components do not hold a true alignment, then yes you may have components to replace. It is worth investing in an alignment. AJ Pierce

Kim Walker, Marketing Director at Peak Automotive Jim, According to my Porsche technician this is VERY common and an alignment is necessary and will make a huge difference.

Suzanne Grego, Technician at City of Philadelphia Fleet Management Jim Meeks, The first thing I would check would be the tire pressure. Overinflating and underinflating could cause this issue. Check the plaque or sticker inside the driver

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