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They did the alignment in late December. I asked them to check it for precisely this reason. Now I'm wondering if they had the right update on the machine at the time.0.210" longer center to center on the upper links will give you 1.0 less camber on air cars and put you right at the end of toe adjustment to achieve near zero toe in. I would suggest your super low life was a function of camber AND toe out in the rear. If you read through this complete thread and similar ones you will find many an example of people with documented tow out; too many for it to be a simple customer driven issue. Put differently, something about the production process and/or shipping drove the rear wheels being pointed outwards.
Not at all. Proper alignment gives good tire wear. The trick is to make sure the alignment is correct. Especially no toe out.Do you think the tire wear concern currently is bad enough to hold off buying the car at this time (P85 with air) ? Or as long as a person is diligent with checking that it would be OK.
I wonder if Tesla will improve this overtime.
Do you think the tire wear concern currently is bad enough to hold off buying the car at this time (P85 with air) ? Or as long as a person is diligent with checking that it would be OK.
I wonder if Tesla will improve this overtime.
I've got a P85 with 19s and I'm at 46k miles now still driving on the original tires. so no, don't hold off. Buy the car. Like yesterday. lol you won't regret it. yes I do check my tires and tire pressure every other week. rotated at 6k, 24k, 36k, and 46k. probably going to get new tires within the next week or two as I am down to about 4/32" with slight inside edge wear. I just had my car serviced last week so that included new camber bolts and an alignment. I should be good to go for another 50k miles on my new set
Can you post your alignment spec sheet? That is some impressive tire longevity for a P85. My 19" Goodyears are close to shot with only 17k miles on an S85. Its mostly inner tire wear, and the car is aligned to Tesla spec. My rear camber was only -1.36.
Spec allows for a good bit of toe in. Ask for the near zero side of the spec for improved wear.
Portland Service CenterWho checked the alignment? When I checked it myself it was quite a bit different compared to the computer printout the SC gave me. Maybe an out-of-calibration machine? Printout said 0.11 dgr rear toe-in, I measured 0.80 dgr toe-out.
So... I've been wondering about the fact that the car was extremely loose in the rear under heavy acceleration. Thought maybe it didn't have the new bushings or camber bolts, but that wasn't the case.
Then the car just burned through a set of the PS2s in less than 6k miles. Inside edge completely corded, while the middle wasn't even on wear bars. I knew it was abnormal wear, I had these exact same tires on my Porsche several times, and managed very consistent wear across the back and mileages around 10k -- despite driving the Porsche much harder.
Did some investigation and found an independent shop to align my car. What I found was -0.25 toe (out) on the rear tires. On each side. In December, it was aligned by the service center to -0.25 and -0.19. The alignment machine printout I have says that the specified range is -0.30 to -0.10, but I'm seeing actual factory specs somewhere in the neighborhood of +0.20 (toe in). Can't imagine why that would cause the inner tire to wear out dramatically faster than the rest of the tire.
So, if you're having extreme wear on the inside edge of the rear, verify your alignment settings and make sure you have toe IN, not toe OUT on the rear.
After extended conversations with the service center, that does indeed appear to be the case.In the case of my service center, the specs programmed into the machine were wrong and the service center had to get Hunter (machine manufacturer) out to program the proper numbers into the machine. You have likely been hit by that as well.
The reason you end up with inner shoulder wear is that the negative camber plus the toe-out ends up creating an intersection point on the inside shoulder where tire meets the road.
Wheel Alignment Explained
Larger amounts of toe (positive or negative) plus larger amounts of negative camber will tear up the inside shoulder of the rear tire. Toe out is worse than toe in but both are bad.
If you choose to stay with Tesa's camber geometry, you will be best served for tire wear by using as little toe in as possible. The possible will either be the minimum of the Tesla specification or a lesser number of your choosing if you are comfortable dictating toe values.
What was your rear camber at?I think once I replace my tires I'm going to get the car re-aligned for as close 0 toe as possible. When I had an alignment done in January it was set to @ 0.21 deg toe in on each side in the rear.