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2018 Forester premium 2.5
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Discussion Starter · #1 ·
Good day All,

I have just installed a new OEM tire on the 2018 Forester Premium with 10k miles on the old tires. The Subaru dealer told me I do not have to shave the new tire because supposedly the old ones still have 11/32 tread left. This does not sound very convincing. Is there any way to confirm that the tires actually match? It does not seem practical to measure the circumference to confirm that they match to within 1/4''.

This is the rear driver side tire. Is there anything I should do to make it easier on the car? I was thinking of keeping the new tire 2-3 PSI below the rest of the tires.

Thank you!
 

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Sahuarita, AZ 2018 Forester Limited
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If the new tire is the exact same tire as the other three, buy a tread depth gauge and measure the tread depth on all four tires. Depending upon which Subaru service advisor you talk to, 2 or 3/32nds difference in tread depth is the maximum difference acceptable.
 

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2017 Forester
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312 Posts
Not sure why you say it doesn’t sound convincing?
Subaru recommends the new tire depth be within 2/32 of the old ones.
If that’s the case in your situation, you should be fine.
 

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2018 Forester premium 2.5
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Discussion Starter · #4 ·
Thank you both!

I have just measured the depths and it appears fine:
toward the center of the tread it is ~1/32 difference and
closer to the sidewall it's more like ~2/32 difference
between the new one and the old ones.

So it may have just been my paranoia. The old tires looked much more worn!

Looking forward, should I rotate them as usual?

Out of curiosity, how would one know that the tires strain the differentials? Would it appear on the dashboard screen where the load on the 4 wheels is shown?
 

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Sahuarita, AZ 2018 Forester Limited
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This is the rear driver side tire. Is there anything I should do to make it easier on the car? I was thinking of keeping the new tire 2-3 PSI below the rest of the tires.
I definitely would not under-inflate the new tire. Assuming that tires wear faster on the front axles you might want to move the new tire to the front driver's side now and rotate over to the front passenger side on the next rotation. Keeping it on the front for two rotation cycles might wear it down closer to the tread depth of the other tires.

Thank you both!

I have just measured the depths and it appears fine:
toward the center of the tread it is ~1/32 difference and
closer to the sidewall it's more like ~2/32 difference
between the new one and the old ones.
Sounds like your outer tread is wearing more than your center tread which might indicate your tires have been underinflated.
 

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2018 Forester premium 2.5
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Discussion Starter · #7 ·
OK, I will rotate it upfront.

I keep the tires a bit overinflated, in the 32-34 range. So I do not know why it wears like that. It's my wife's car, so it could be from the aggressive cornering :)

Thank you!
 
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