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Old 01-15-2025, 04:50 AM   #1
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Join Date: Oct 2024
Location: San Jose, California
Posts: 76
Steering wheel shake / vibration at highway speeds ( 60 mph + )

Happy Wednesday Boxster enthusiasts!

I've been slowly working my way through my new-to-me 2002 Boxster base model's eccentricities. I'm getting there, but next on my list ( and possibly one of the more annoying items ) is a steering wheel shake that appears over 60 mph. It's not "violent", but is pronounced enough that it ruins the driving experience at those speeds, and doesn't feel entirely safe.

Here's what I've done so far:

1) Checked that the air pressures are correct.

2) Had an alignment done. Made no difference at all.

3) Had all the wheels balanced at a shop that uses the road force balancing machine. This did improve the shake by about 50%.

My next focus is the tires, while they're in good condition and relatively new ( I think the previous owner probably put them on to sell the car ), they are pretty "cheap".

Front ( both sides ): Nexen N5000 PLUS 235 / 45 R17

Rear ( both sides ): Nexen N Priz AH8 235 / 45 R17

I'm wondering if rotating the wheels + tires will help me with my investigation into this issue. I was planning to take the rear wheels + tires and move them to the front ( rear passenger swapped with front passenger, rear driver swapped with front driver ) and see if anything changes.

Initially I was going to just go buy new tires and see if the problem resolved, but I'd rather not throw that much money into a guess. Will doing this rotation tell me anything? Or am I wasting my time doing it?

Thanks as always, you all are amazing and have already helped me take this car that I was ready to get rid of to something that I'm already really enjoying!
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