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      11-22-2019, 11:35 AM   #23
Ringo2712
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Quote:
Originally Posted by VTENGR View Post
I can't imagine the difference between running 32 and 35 would cause this extreme wear. When tires are under inflated you see excess wear on the outside treads, but on both sides (inside and outside). Is that the case for you? I always thought this type of wear happens when tires are severely under inflated - like running 25 PSI for a long time.

I'm running 20" Contis on my ML and have them at or close to 40psi - tire shows 50psi max.
No, the wear is only on the outside
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      11-22-2019, 12:06 PM   #24
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Quote:
Originally Posted by Ringo2712 View Post
Quote:
Originally Posted by VTENGR View Post
I can't imagine the difference between running 32 and 35 would cause this extreme wear. When tires are under inflated you see excess wear on the outside treads, but on both sides (inside and outside). Is that the case for you? I always thought this type of wear happens when tires are severely under inflated - like running 25 PSI for a long time.

I'm running 20" Contis on my ML and have them at or close to 40psi - tire shows 50psi max.
No, the wear is only on the outside
Very interesting.
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      11-22-2019, 07:52 PM   #25
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Sounds like a camber issue, and pressure issue - maybe both from the factory.

I run mine at 34/36; remembering I've only got 20" (744 Ms), but in my experience running tyres down at the low end you give a softer ride, a little extra grip (since there's more tyre surface on the road) and your tyres last longer.

Not sure why anyone wants to run up at 40psi or beyond?? Tyre wear can get really bad, and you end up with a hard ride - especially with low profile tyres in the 21" and 22".
Also, running tyres at high psi also makes you more susceptible to picking up nails/screws or anything else that can give you a puncture.

The only time I run higher is when I do long towing trips, and by higher I mean 36/38-39, still dont go into the 40s.
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      11-23-2019, 12:04 AM   #26
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I’m very interest, i have to take the decision if 22 or 21 next week, are the 22 premature wear or its just this case ?

I prefer the design of 22, but if only are good for 10,000km I’m out for 22

Thank you.
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      11-23-2019, 08:14 AM   #27
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Assuming alignment and tire pressure are within spec, in an all wheel drive vehicle the front tires tend to wear down faster due to more friction. Any spirited driving would accelerate the wear.
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      11-23-2019, 08:22 AM   #28
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Quote:
Originally Posted by James_G0530d View Post
Sounds like a camber issue, and pressure issue - maybe both from the factory.

I run mine at 34/36; remembering I've only got 20" (744 Ms), but in my experience running tyres down at the low end you give a softer ride, a little extra grip (since there's more tyre surface on the road) and your tyres last longer.

Not sure why anyone wants to run up at 40psi or beyond?? Tyre wear can get really bad, and you end up with a hard ride - especially with low profile tyres in the 21" and 22".
Also, running tyres at high psi also makes you more susceptible to picking up nails/screws or anything else that can give you a puncture.

The only time I run higher is when I do long towing trips, and by higher I mean 36/38-39, still dont go into the 40s.
Alignment is OK and within specs. Not a camber issue. Pressure 35/37
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      12-05-2019, 09:36 AM   #29
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Quote:
Originally Posted by themnmd View Post
Assuming alignment and tire pressure are within spec, in an all wheel drive vehicle the front tires tend to wear down faster due to more friction. Any spirited driving would accelerate the wear.
came in her for this exact discussion and have personally drawn the same conclusion.

i've got a 40i with 21s all around (all season run flats) and noticed some early wear on the fronts, outside only.

sure it could need alignment, but isn't it just as likely a function of the mass of this vehicle and the fact i toss it around a bit?
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      12-05-2019, 10:00 AM   #30
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Quote:
Originally Posted by ppagiga View Post
Quote:
Originally Posted by themnmd View Post
Assuming alignment and tire pressure are within spec, in an all wheel drive vehicle the front tires tend to wear down faster due to more friction. Any spirited driving would accelerate the wear.
came in her for this exact discussion and have personally drawn the same conclusion.

i've got a 40i with 21s all around (all season run flats) and noticed some early wear on the fronts, outside only.

sure it could need alignment, but isn't it just as likely a function of the mass of this vehicle and the fact i toss it around a bit?
also aggressive suspension tune like M cars would quicken the wear due to camber or toe in.
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      12-05-2019, 10:36 AM   #31
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I’m having exactly the same issue on the 22 contis and only done 2500 miles from new!! Was running at 32/35 as per door plate in the UK for the 30D M sport. The dealer looked and said to up the psi so im now at 35/39
Ill see in another 2000 miles how it looks but it appears as if understating the psi is happening on a few models according to the dealer feedback.
The outerwear on the shoulder is on both sides of the tyres though.
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      12-05-2019, 10:57 AM   #32
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The manual on my X5 40i for my 22” wheels states for my front 275/35R should be 38 psi while my rear 315/30R should be 45psi for up to 100 MPH. I have Continentals.
Don’t understand why dealers are stating lower PSI’s? I would have thought the manual and the same reading on the door would be the correct PSI?
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      12-05-2019, 11:51 AM   #33
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Quote:
Originally Posted by poppop View Post
The manual on my X5 40i for my 22" wheels states for my front 275/35R should be 38 psi while my rear 315/30R should be 45psi for up to 100 MPH. I have Continentals.
Don't understand why dealers are stating lower PSI's? I would have thought the manual and the same reading on the door would be the correct PSI?
These lower psi seem to be from countries outside of North America.
So are you running 38/45? Any premature wear on the Contis, and how many miles?

FWIW: Here is the M50i psi recommendations (full load) under 100 mph. There's nothing noted for light loads however:
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      12-05-2019, 12:31 PM   #34
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Quote:
Originally Posted by Kief View Post
These lower psi seem to be from countries outside of North America.
So are you running 38/45? Any premature wear on the Contis, and how many miles?

FWIW: Here is the M50i psi recommendations (full load) under 100 mph. There's nothing noted for light loads however:
Sorry I can’t help with mileage since my X5 is only two weeks old, with 200 miles on it. Your chart shows the 38/45 PSI that I set mine at. I have my own pump and my trusty gage to confirm correct PSI.
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      10-25-2020, 09:12 PM   #35
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I have same problem with my front tires. 3 months I paid dealer to do alignment. Now the right tires need to be replace. Should I take it to dealer have them look at it or just replace front 2 tires?
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      10-26-2020, 12:39 AM   #36
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If I read the spec correctly, those are summer, high performance tires that tend to be soft and sticky...they also are geared very much towards maximum traction than longevity.

If you're in the USA or have a tire sourced for the US, the tire will have a three digit number on it, maybe something like 240 with some letters to indicate traction and temperature for the tire designation after the size. That's the estimated percentage of a 'standard' tire. That would represent 240% of the standard tire's life. It's a good relative guide, but your results will easily vary from that 'standard'.

Tires sold for European delivery (and maybe other markets) will have a different designation. The Continental website didn't seem to say what that value was, and the US market doesn't seem to get that model.

It seems like the recommended pressure for the 22" tires is higher than you indicated...that would partially account for the greater wear on the outsides of the tread.
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      10-27-2020, 05:01 AM   #37
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I'm running the same tire and pretty sure the manual recommends higher pressures. I would up them to around 38 front.

The X5 isn't a light car!
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      10-27-2020, 08:53 AM   #38
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low tyre pressure.
with it being a heavy car with thin sidewall the sidewall will prop up the car greatly when cornering steering etc and hence the wear.
If manufacturers recommended a higher tyre pressure tyre life will improve but ride will be stiffer and the manufacturers Don't want that.
I would up the psi by 10%all around ride might get a tad harsher but car will drive better.
The above is the conclusion I reached when my front tyres outer shoulder wore faster on both my cars and ive gone with 10%over recommended.
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      10-27-2020, 08:56 AM   #39
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when I go into iDrive to see what it recommends for my 22" tires it shows 42 front 45 rear - this takes into account the temperature of the tire, so it varies. but after about 5 minutes of driving that's what it constantly has been showing me.
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      10-27-2020, 09:04 AM   #40
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I called Continental then they send me to discount tire for them to check it out. I got 50% discount for 2 new tires.
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      10-27-2020, 09:09 AM   #41
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Quote:
Originally Posted by VTENGR View Post
when I go into iDrive to see what it recommends for my 22" tires it shows 42 front 45 rear - this takes into account the temperature of the tire, so it varies. but after about 5 minutes of driving that's what it constantly has been showing me.
Did you put 42 psi on the front and 45 in the rear?
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      10-27-2020, 09:11 AM   #42
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Originally Posted by Hchhuor View Post
Did you put 42 psi on the front and 45 in the rear?
Yes +/- 1-2 PSI
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      10-28-2020, 06:51 AM   #43
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I'm looking @ the P ZERO ALL SEASON Ultra High Performance All-Season tires and they're saying they have a 50k tread coverage warranty - does that mean if they experience "premature" wear they will be replaced?


Tires
https://www.tirerack.com/tires/tires...0Sport%20Brake

Warranty
https://d3nv2arudvw7ln.cloudfront.ne...erWarranty.pdf
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      10-28-2020, 06:59 AM   #44
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Yes. Why didn't you read the warranty document you linked? All explained in there ...
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