Some folks were wondering about the Michelin Pilot Sport 4s BMW star version of tire and the difference with the regular 4s. Note: Michelin makes a BMW spec tire that is referenced as the BMW star and has a star embossed on the side of the tire.
There is a web site tyrereviews.com that has an article specifically on this. Look under "features" on the right side and the title Michelin 4s and BMW Star or something like that. There apparently is considerable difference, the author spent time with a Michelin rep and the details are included...an example:
Quote:
What are the exact differences between the * marked PS4S and the regular aftermarket tyre?
This is the bit that took nearly an hour to explain, so I'll be paraphrasing a lot here, but a lot has changed!
The compound is the biggest difference, as with the OE tyre you can design the compound around the specification from BMW, and the changes are far greater than even I'd imagined with my small amount of insider knowledge.
The aftermarket tyre has a 2 compound design, with what Michelin calls black carbon + on the outer section of the tyre for cornering grip, and a high silica compound on the rest of the tread which is great for many things like wet grip, low rolling resistance and good mileage.
The BMW specification front tyre not 2, but FOUR compounds! Firstly, the black carbon compound they use is black carbon+++, with two extra plusses. This I've been told is more like the cup 2 compound than the 4S.
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there is more, thats just a part. read up if interested.
Also Pirelli also makes a BMW star specific Pilot Zero pz4 but i don't know the specific differences on that tire. That tire is very common factory provided tire on the M240x.