Star Rated Tyres

[ronk]

I'm looking at fitting new rubber and don't know if its worth fitting the STAR rated/marked tyres - Is there any difference and what are the implications if I ignore the star rated product?

[B21]

Star rated is BMW OE approved..

For XDrive vehicles it matters a lot

For others your call...

[ronk]

Star rated is BMW OE approved..

For XDrive vehicles it matters a lot

For others your call...

Is it just BMW's "Kings magicsuit of clothes" or is there something else?
I just can't imagine a tyre manufacturer running a BMW tyre line.

[B21]

Star rated is BMW OE approved..

For XDrive vehicles it matters a lot

For others your call...

Is it just BMW's "Kings magicsuit of clothes" or is there something else?
I just can't imagine a tyre manufacturer running a BMW tyre line.

* rated tyres have tighter spec on things like rolling radius..so for xdrive the standard tyres don't have a tight enough spec on this..

I found out a lot about it when I was looking at xdrive 435Ds.....

[ronk]

* rated tyres have tighter spec on things like rolling radius..so for xdrive the standard tyres don't have a tight enough spec on this..

I found out a lot about it when I was looking at xdrive 435Ds.....

That makes a lot of sense to me now!
Ive heard of warranty work refusal when * rated weren't fitted and it will influence my decision when new rubber is required for the 335X Drive - But for the 35is ?

[B21]

Largely irrelevant for the 35is as much better rubber has subsequently been released...Conti Sports Contact 7s

[ronk]

Thanks P
I was looking at MPS4's - but I will certainly give the Conti a look

[sars]

Star rated tyres as B21 are specifically compounded for BMW, however there is usually a list of preferred tyres in your handbook. If you have a lease car there may be a restriction on what tyre you can fit, if not then you can choose.

The issue B21 described was a thing with the original X5, that had no slip allowance between differentials, it does not apply to the modern xdrive system that can distribute torque between axles via a multi plate clutch. That’s why you can have a staggered set up, as per the 435xd, where there’s a 1.5mm difference in diameter.

I think the transfer box issue is a one that’s been hyped up by every BMW forum, reality is that any system that couldn’t take a small difference in diameter wouldn’t be in production for long as it wouldn’t stand up in court. One of the prerequisites of European standards is that obvious and foreseeable problems have to be designed into a product during development and this most certainly qualifies.