Typical MPSS Cracking

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beemer5711
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Typical MPSS Cracking

Post by beemer5711 » Tue Mar 20, 2018 4:28 pm

I know that PSS are known for side wall cracks but how much is too much?
My car is a Jan 17 build, March 17 registered and has <7000 miles on it.
I have been keeping an eye on the side wall cracking but it's starting to look bad now. The tyres are Dec 16 date stamped so not too old. They have also never been kerbed.

What to you think?
Thanks in advance.

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Re: Typical MPSS Cracking

Post by marco_polo » Tue Mar 20, 2018 4:30 pm

Looks like quite light cracking for an MPSS, I've seen worse than that after winter. They're known to go off really badly around -6° C , definitely not suited to very cold temps at all.
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Re: Typical MPSS Cracking

Post by beemer5711 » Tue Mar 20, 2018 4:34 pm

Cheers Marco. This car isn't daily driven will that aid cracking do you think?
My front shoulder wear is quite bad so is 33psi likely to help reduce this so I can maximise the tyre life? There is still 5.5mm of tread across the central 3/4.
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Re: Typical MPSS Cracking

Post by marco_polo » Tue Mar 20, 2018 4:37 pm

Minimal use in winter makes things better, not worse.

Try 34 or 35 all round as a work-around to help a tiny bit, the proper fix is to mechanically add some camber though. More pressure should help minimise the cracking too; less tyre-wall deflection.
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Re: Typical MPSS Cracking

Post by Menace » Tue Mar 20, 2018 6:24 pm

Just adding to what MP has said - I replaced my MPSS tyres (all four) after 25k and they had as much of not more cracking on all four (although the rears where the worst) for most of their life. BMW flagged it as an advisory issue when serviced around the 18k mark. I think someone on here once upon a time did manage to get a replaced tyre from Michelin as a result of this issue but I wouldn’t waste my time chasing that down as an option.

Do what you have been - add a little more pressure and keep a regular eye on them.
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Re: Typical MPSS Cracking

Post by beemer5711 » Tue Mar 20, 2018 7:29 pm

Cheers guys some M4 LCA and a proper geom seem to be the way to cure the shoulder scrubbing then. As for the rears I'll keep an eye on them. I think the recommended pressures are 33F 35R psi are they not?
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Re: Typical MPSS Cracking

Post by Cw16 » Tue Mar 20, 2018 7:59 pm

Do you think regular tyre black helps with this? Mine is a March 16 car on 23k original tyres and they look nothing like that. I do regularly use meguiars tyre black.
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Re: Typical MPSS Cracking

Post by beemer5711 » Tue Mar 20, 2018 8:11 pm

Cw16 wrote:
Tue Mar 20, 2018 7:59 pm
Do you think regular tyre black helps with this? Mine is a March 16 car on 23k original tyres and they look nothing like that. I do regularly use meguiars tyre black.
I often use Autofinesse satin which is a tyre creme so I'm not sure. They look stinking here because the car done a 360mile round trip on the weekend to collect a friends new car.
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Re: Typical MPSS Cracking

Post by JohnsM135i » Tue Mar 20, 2018 9:08 pm

beemer5711 wrote:
Tue Mar 20, 2018 4:28 pm
I know that PSS are known for side wall cracks but how much is too much?
My car is a Jan 17 build, March 17 registered and has <7000 miles on it.
I have been keeping an eye on the side wall cracking but it's starting to look bad now. The tyres are Dec 16 date stamped so not too old. They have also never been kerbed.

What to you think?
Thanks in advance.

P.S Photobucket has gone to the dogs! So frustrating to use now.
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Out of interest is the car garaged or left outside?

I,m wondering if the sun has any influence ?
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Re: Typical MPSS Cracking

Post by beemer5711 » Wed Mar 21, 2018 7:12 am

It’s outside mate but no sun gets to it, it’s in a sort of car port but with no roof. Garage in front of it, 6ft fence one side, the house wall on the other side and 6ft gates at the back.
This is the best I can show it.
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Re: Typical MPSS Cracking

Post by Menace » Wed Mar 21, 2018 8:16 am

beemer5711 wrote:
Tue Mar 20, 2018 7:29 pm
I think the recommended pressures are 33F 35R psi are they not?
All depends on what you load the car with and to a degree how you drive the car. Spirited (driver only) setup can be as low as 32psi all round and is popular with folk on here. BMW advise 32psi on the fronts and when fully ladened anything up to a crazy 46psi on the rears assuming you are on the stock tyre sizes.

Personally I run mine with 34psi in the fronts (to assist with outer wear) and 35psi on the rear mainly because we are a one car family and the wife normally insists the boot has to be as full as it is - oh and there are two child seats in the back which quite often have kids in them.

I check them approx 20 times a year and adjust to the conditions / intended use. Hope that helps.
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Re: Typical MPSS Cracking

Post by beemer5711 » Wed Mar 21, 2018 11:36 am

Cheers mate that does help. It’s only ever me and a passenger in the car with an empty boot. I will put the fronts to 34 for the shoulder wear but can I run lower at the back or is it advised to have the rear the same/harder than the front?
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Re: Typical MPSS Cracking

Post by marco_polo » Wed Mar 21, 2018 3:10 pm

I'd usually recommend at least equal pressure in the rears for stability.
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Re: Typical MPSS Cracking

Post by Triple S » Wed Mar 21, 2018 4:10 pm

I use a good quality tyre dressing - Maguiares which helps but you need to keep an eye on the inner tyre walls. I run my tyres fairly hard 36psi front 41psi rear and find the handling is fine for me with minimal front tyre shoulder wear.
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Re: Typical MPSS Cracking

Post by beemer5711 » Wed Mar 21, 2018 7:52 pm

Cheers guys, Friday is the next time I’m gonna be driving the car so before I pop out I’ll check and adjust my pressures.
Current:
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VW B6 Passat Highline

Gone:
VW MK5 Golf GTI
BMW 135i N54
VW MK5 Polo GTI 20v
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