Front tyre outer edge wear E90 320d Msport

[russellhayward]

Following on from my 1 series post.

 

2011 E90 320d Msport

 

Runflats from new (yuk). Changed at 26k miles for Contisport 3 (non runflat) all round. See alignment done at 26k miles below. I don't remember any unusual wear on the runflats and I do remember thinking the fronts have loads of tread left, what a waste. So no front shoulder wear with the runflats, and the "before" alignment settings.

 

 

 

So, at 50k miles I changed all four tyres again. The rears had worn out ( no unusual wear). The fronts had the following problems - OSF outer shoulder was slick. NSF - worn but not slick and still had visible tread. Rest of tyre both sides around 4mm.

 

Alignment was checked, resulting in the below. Then adjusted back into spec. It wasn't far out ?

 

 

Car is mainly driven on the motorway (80%), and mainly in lanes 2+3.

 

I am wondering if the outer shoulder on these Conti 3 is a problem. See my 1 series post.

[russellhayward]

So since 50k miles I have Assim 2 all round. Wear on rear is even, although alarmingly fast, down to 5mm after 5k miles.  

 

Fronts seem to be wearing fairly evenly so far, the shoulder design is are more akin to the rest of the tyre, unlike the Conti. I'd say both shoulders 0.5mm less than rest of tyre. Although due to the design this measurement isn't actually that close to the outer edge of the tyre. Visually no excess wear apparent.

 

Car is run at stock pressures, and regularly checked with a very decent gauge.

[Tony]

Point to note is on performance cars tyres are deemed as "sacrificial", meaning their job is to transport the cars performance/ technology and grip it to the road. On some high end performance cars the tyres might only last 5k and that's without booting it

[russellhayward]

Yes, have had several 400bhp+ motors and am aware of this. However, the unusually front o/s harsh wear on this car is puzzling, unless the tyres design comes into play. But why so much more on the o/s than the n/s.

 

Having had several BMW's I can safely say the rears usually last 22-25k, 330i x 2,530d, 535d, 320d all the same. Never had Goodyears before on any of them, so that must be down to the wear rate of this tyre.

 

Routinely had 40k from the fronts too, and no wear problems.

 

All these cars were set-up at a motorsport place with a dedicated suspension specialist.

 

So now have two cars with the same tyres, set-up at a new place, both with front shoulder wear. It's either the set-up or the tyres ?

[Tony]

Remember the OEM settings are a suggestion not the law. If moving the camber or toe in order to improve the footprint a good calibrator should do that.