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[Two] New rear tires and now autopilot weaves

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I had to replace the rear stock tires with a pair of Michelin Pilot Sport All Season 4 tires. Today I used Autopilot on a 60 mile round trip. The car was weaving slightly but noticeably in the freeway lanes. Just enough to be annoying. It didn’t do this before. It held a nice steady line in the lane.

Is a wheel alignment is needed? What else should I check or investigate?
 
I had to replace the rear stock tires with a pair of Michelin Pilot Sport All Season 4 tires. Today I used Autopilot on a 60 mile round trip. The car was weaving slightly but noticeably in the freeway lanes. Just enough to be annoying. It didn’t do this before. It held a nice steady line in the lane.

Is a wheel alignment is needed? What else should I check or investigate?
I am having this exact problem right now. What was your solution?
 
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Solution (sort of):

I got a wheel alignment. The report showed just one adjustment 0.1 out of spec, which they corrected. Didn’t fix the problem.

Second step, I stopped worrying about it. The problem went away after a few weeks. If I had to drive every day on a long commute, I would have pursued a solution.

Sorry, I’m not not much help. I would have tried the tire rotation next. At present, the problem is gone, auto steer tracks straight and smooth, now.
 
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Already said it earlier in here, but when some tires are too different a diameter than others, the car can't handle it. Solution is make all the tires the same diameter. This *might* happen naturally just driving around for a while if they are close.
This makes technical sense. It makes little sense from a money and sustainability standpoint. I got in the situation because one tire needed to be replaced. Keeping all tires close to the same diameter would mean buying four tires even though three of them a fine. The car should be able to handle one new tire when only one needs to be replaced.

I’m wishing for your solution to be not needed, not that your solution is wrong. Hopefully improvements can change the need to keep similar diameter on all the tires.
 
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This makes technical sense. It makes little sense from a money and sustainability standpoint. I got in the situation because one tire needed to be replaced. Keeping all tires close to the same diameter would mean buying four tires even though three of them a fine. The car should be able to handle one new tire when only one needs to be replaced.

I’m wishing for your solution to be not needed, not that your solution is wrong. Hopefully improvements can change the need to keep similar diameter on all the tires.

Yes I agree it is a sad state of affairs and doesn't seem like it *needs* to be that way, but that it is a limitation of the software as currently programmed.
 
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Exactly my problem, I replaced 2 rear tires - they only had Michelin PILOTS and the front are original Michelin Primacy. The car became slightly squirrely. Its been 9 months but I just went to the tire store today to discuss this. I am having them find 4 new original Primacys for me. $1,200

PRIMACY MXM4 - SIZE: 235/45R18 -​

 
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My m3LR failed warrant due one tyre at "0mm" tread. Our warrants allow for the tyres to wear 1.6mm before next annual warrant (costly but true). Replaced full set with Michelin Primacy 4s, aligned and away. Straight, quiet and more economical so far; down from 1.52 to 1.33 power usage... No point in trying to be cheap, guys...
 
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I didn’t discuss it. Maybe I mentioned it. Was not a factor for my issues. I check my pressure regularly and would have confirmed good pressures during my investigations.

It’s a good thought to check!
I was actually thinking that different tire types can react differently to different pressures. For example, in previous vehicles I have had different tires take as much as +/- 5 PSI to achieve the same priority characteristics (comfort, efficiency, precision, etc). So, while they may be set at the desired pressure, they may need more if the sidewalls happen to be less stiff.
 
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I have a similar problem. 2018 Tesla Model 3 LR rear wheel drive. Had Continental Extreme Contact DWS 06. Replaced 2 worn rear tires with same type. Front tires to the rear. The Model 3 drives now like a boat. Turning left or right gives you a weird feel in the spine. Autopilot does not drive straight, but has an oscillation. You can feel it at speeds above 60. All tire pressures are correct. Discount Tire did the installation.

Before tire change the car was rock solid on the road. Handled curvy roads extremely well. Now the car is completely wobbly in a curve. Really dangerous.

Any suggestions welcome.
You just described my situation perfectly. My car no longer handles corners safely.

I have a 2023 MYP and just had the rear tires replaced with the exact same OEM Michelin Sport 4S 275/35/21s after 22K miles. My car performed tightly and with precision prior to the tire change. Afterwards, I now get the oscillation on long freeway stretches in autopilot at speeds over 65, and a dangerous lateral movement in the rear when entering into curves while braking, or making sudden slight movements like dodging a pothole. The rear of the car has a delayed reaction to movement which then throws the entire momentum of the car in the wrong direction at speed. It’s dangerous.

I read elsewhere that this is not an alignment problem, but instead one with the cars understanding of the old tread south versus new, and that going into service settings to recalibrate the wheels may fix it. I’m on a business trip right now so can’t do anything about it. But thought in the meantime someone might have additional insight here.
 
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You just described my situation perfectly. My car no longer handles corners safely.

I have a 2023 MYP and just had the rear tires replaced with the exact same OEM Michelin Sport 4S 275/35/21s after 22K miles. My car performed tightly and with precision prior to the tire change. Afterwards, I now get the oscillation on long freeway stretches in autopilot at speeds over 65, and a dangerous lateral movement in the rear when entering into curves while braking, or making sudden slight movements like dodging a pothole. The rear of the car has a delayed reaction to movement which then throws the entire momentum of the car in the wrong direction at speed. It’s dangerous.

I read elsewhere that this is not an alignment problem, but instead one with the cars understanding of the old tread south versus new, and that going into service settings to recalibrate the wheels may fix it. I’m on a business trip right now so can’t do anything about it. But thought in the meantime someone might have additional insight here.
Sure you can. Just go into the service tab in settings and reset the tire service mileage. That will reset the tire diameter expectation
 
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