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Technical Topics Wheels and Tires Noticeable vibration after 130 km/h

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      10-05-2021, 01:27 PM   #1
turbox
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Noticeable vibration after 130 km/h

I own a G20 320d xDrive and had the factory tires (Bridgestone Turanza RFT T005) for about 37.000 kms. I decided to go for non RFTs and went with Michelin Pilot Sport 4S (not star marked ones). Before the tire replacement I didn't have any vibration issues. However, after the replacement I can feel a vibration from the steering wheel, seat and floor after 130 km/h. I haven't done any road force balance yet and I am going to rebalance my tires tomorrow. Any ideas what can be the issue here?

Wheels: 19" M Sport
Front: 225/40 R19
Back: 255/35 R19

Besides that issue, what would be best tire pressure to have on this particular set?

The dealer put 41 psi by reading from the door, but the tire's max indicates 40 psi max. I deflated them to 36 psi (cold) but, iDrive keeps popping a warning that my tires are low on pressure. It recommends me to have 39psi, but I think that overinflates the tire. As my setting I have the summer setting with the rear wheel 255/35 R19 96Y as my setting.

Last edited by turbox; 10-05-2021 at 01:53 PM.. Reason: Missing info
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      10-05-2021, 05:50 PM   #2
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First I'd set the PSIs as per iDrive recommendation when the car is on the ground and do a test run. If that doesn't work, then get another wheel-balancing done (on all 4). I had the same issue on one of my previous cars after new tyres installation. Mine was at 85mph (~138km/h; close enough haha). Went to a different workshop for a fresh wheel-balancing job. That fixed the issue. If none of these fixes your problem, I'd suspect you have a defective tyre.
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      10-27-2021, 10:41 PM   #3
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I started having a vibration noise under the driver's footwell at above 65mph and it goes away after 80....it sounds like a water bottle cap vibrating. It only happens when I press the accelerator. Thoughts?

I have a 2021 G20 M sport with stock potenzas
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