[330cdsport]

Originally Posted by doughboy

That is definitely a rub mark. (IMO)

Look on the 3rd & 4th tyre photos.

Its not possible for that to be road wear unless the wheel camber was about 30 degrees off vertical!! That bit of the tread is half way round to the sidewall!!

It must be rubbing something at full suspension compression.

Thats what I thought too when i saw it on my tyres but could not see any equivalent rubbed part on the inside mudguard.

It is a really strange wear mark.

[Dave_3]

Originally Posted by dxb335d

So far I believe its the excessive factory camber coupled with softer sidewalls of the Non runflats.

To be fair, you should add driving style to that list too. Not having a go at you - but I am guessing there is a direct correlation to wear and "enthusiastic" driving style. How hard you lean on/load the suspension laterally (corners) and longitudinally (acceleration).

I am still on my original tyres and my car is older than yours I have had it tracked 4 times, last at Battersea - as I am a little like the Princess and the pea when it comes to tracking and it took that many attempts until it was done RIGHT. And not just "it is within tolerances". It makes a difference.

Though it is about time to look at new tyres for the front.

Some of the pics previously look decidedly iffy. I'd definitely get it tracked in those cases when I fitted new tyres.

D.

[NFS]

Originally Posted by Dave_3

To be fair, you should add driving style to that list too. Not having a go at you - but I am guessing there is a direct correlation to wear and "enthusiastic" driving style. How hard you lean on/load the suspension laterally (corners) and longitudinally (acceleration).

I am still on my original tyres and my car is older than yours I have had it tracked 4 times, last at Battersea - as I am a little like the Princess and the pea when it comes to tracking and it took that many attempts until it was done RIGHT. And not just "it is within tolerances". It makes a difference.

Though it is about time to look at new tyres for the front.

Some of the pics previously look decidedly iffy. I'd definitely get it tracked in those cases when I fitted new tyres.

D.

Enthusiastic driving normally scrubs the OUTER edge of tyres though.

[Dave_3]

Originally Posted by NFS

Enthusiastic driving normally scrubs the OUTER edge of tyres though.

Exactly why it would be setup with negative camber. Still possible to really lean on the inner wheel to get the outer edge to scrub, but the offside tyre will be trailing/"lighter" (lifting of wheels you see in touring cars) at very pronounced camber ... not sure if the ESP would sense this and apply any light braking there ?

Hard acceleration probably induces more squat - effectively increasing the negative camber probably at the time of any burnouts, focusing on a thin strip of inner tyre.

D.

[NFS]

Originally Posted by Dave_3

Exactly why it would be setup with negative camber. Still possible to really lean on the inner wheel to get the outer edge to scrub, but the offside tyre will be trailing/"lighter" (lifting of wheels you see in touring cars) at very pronounced camber ... not sure if the ESP would sense this and apply any light braking there ?

Hard acceleration probably induces more squat - effectively increasing the negative camber probably at the time of any burnouts, focusing on a thin strip of inner tyre.

D.

So Carl needs to corner harder to even out the wear?

[dxb335d]

Originally Posted by Dave_3

Exactly why it would be setup with negative camber. Still possible to really lean on the inner wheel to get the outer edge to scrub, but the offside tyre will be trailing/"lighter" (lifting of wheels you see in touring cars) at very pronounced camber ... not sure if the ESP would sense this and apply any light braking there ?

Hard acceleration probably induces more squat - effectively increasing the negative camber probably at the time of any burnouts, focusing on a thin strip of inner tyre.

D.

Dave, i have already stated that ive done only one small burny and one quick doughnut at santa pod on this set of tyres.

SO that isnt really why, that jus acceletates it.


Probably more the ''squatting'' ou tof low speed bends etc.

Originally Posted by NFS

So Carl needs to corner harder to even out the wear?

LOL, I dont think I can corner any quicker around Snett with out some work done on my car LOL. (coilovers etc)

[TnTTIT]

I think we should see what the differences are between the 19" and 17".
Because with the 17" I didn't have that kind of wear at all, it was just normal wear. On both the 19 and 17 the tyres are re050a runflats, 255/30-19 and 255/40-17.

Perhaps a 17" is more flexible because it has a higher sidewall, but flexible and runflat don't go together I guess. If it is more flexible, can this cause less wear because the tyre sits less on the edge? But then I imagine that a 19" non runflat is even more flexible than a 17" runflat and there are people with 19 non rft that have the same problem.

Or can it be that a 335 SE which has standard the m-sport suspension but has standard 17" wheels has a different setup from the factory than an m-sport with 19"? I doubt it because there are 19" m-sport riders out here with the same problem.

If that is not the case, the only difference I see is that with the 19" the inner edge of the tyres is 6mm more to the inside of the car. Is this the problem? Or does this cause rubbing as some people suggest?

Ooh I don't know anymore.

Can someone come up with an explanation why 17's don't and 19's do???

[635d]

I would still get an independent check carried out on a Hunter machine so you can see the values. My other car was tracked 3 times by 3 different garages and you can see how far out it was. You can see the before and after and now its like a new car. The rear toe can be adjusted and would wear on the inner edge if the toe was out.

If the alignment is then found to be ok then you can only pursue with BMW as that amount of wear on the inner edge isnt correct.

[willhollin]

Originally Posted by 635d

I would still get an independent check carried out on a Hunter machine so you can see the values. My other car was tracked 3 times by 3 different garages and you can see how far out it was. You can see the before and after and now its like a new car. The rear toe can be adjusted and would wear on the inner edge if the toe was out.

If the alignment is then found to be ok then you can only pursue with BMW as that amount of wear on the inner edge isnt correct.

The company you used pretty good then?

[Serjames]

I'm going to knock the camber back from -1 to -0.5 or maybe 0 I dunno

With my uprated rollbars, I have a very stiff rear anyway... very little side to side movement....

I assume I'll need to run a full KDS after changing the camber... or will that just confuse the machine ?

SJ

[E92Fan]

Originally Posted by Serjames

I'm going to knock the camber back from -1 to -0.5 or maybe 0 I dunno

With my uprated rollbars, I have a very stiff rear anyway... very little side to side movement....

I assume I'll need to run a full KDS after changing the camber... or will that just confuse the machine ?

SJ

You'll need to change the camber whilst the car is on the KDS machine. Have it aligned correctly first, then start altering the rear setup by X degrees and minutes on either side. Make sure the adjustment is of a set numerical value either side so that you have an even camber change. Oh, and your car should be fully fueled, but empty of any luggage.

[Budgie]

Ohhh mate Carl i swear ...u r hilarious...one small burny and a doughnut at Santa Pod..lol

What about the 15 drag starts we done each lol.....u gotta laugh people.

Me and carl will do a xmas essex comedy double act on stage in Dec 09.

What would this forum do without u bud lol

[acerboo]

my cars has done nearly 19000 miles, gently driven no track work always drive around potholes and tyre pressure runflats kept spot on just noticed signs of wear on the inside rear tyres, both evenly worn with 5mm rear and 7mm front. this inside wear cannot be right as the rest of the tyres have plenty left in them but looking at the wear i reckon i will be dumping them this year car was fitted with 19"s from the factory.

[Ant Man]

Originally Posted by E92Fan

You'll need to change the camber whilst the car is on the KDS machine. Have it aligned correctly first, then start altering the rear setup by X degrees and minutes on either side. Make sure the adjustment is of a set numerical value either side so that you have an even camber change. Oh, and your car should be fully fueled, but empty of any luggage.

Weighting of the car depends on how many people, luggage and fuel that you usually run with. James if you usually have only yourself in the car, get it weighted with your body mass or if you usually travel with the mrs, add her weight too.

[zltm089]

Hi guys!!!

I recently checked my rear tyres, which are Factory fitted Bridgestone Potenza Run Flats.

I am experiencing a similar wear like dazzapb who posted his pics previously.

My tyre pressure at the moment is 38 Front and 42 Rear and I have 18inch wheels.

I would like to know if my tyres are legal at the moment and if the wears are "normal"? I noticed that it seems to wear on the inside bit as well....

Any comments guys...

Cheers!

[zltm089]

here are some pics,

are the tyre pressure too high? (42psi)

are the wears even?

the outer part looks fine.

[zltm089]

There is plenty of thread left in the front ones, so I was hoping to hold on to them until the end of the year when I will have enough money to get the 19 inch BMW Performance wheels with new tyres and the carbon strut brace and my aero front lip!

However, since I drive everyday to work and at this rate, I don't think that the rear tyres will last that long?

Any advice or comments welcome!

Thanks!

[dxb335d]

Mate the inside does not look that much more worn than the outside. ALthough the middle-right hand side you have lost a bit of tread which is weird.

[zltm089]

yeah....duno, if i over inflated the tyres???....

[F31-340i]

I notice this issue is very common on E92/E93 models with 19" rims - is the problem less serious but still there with 18"?

Also, I'm planning on putting some 19" 225s on my E91 - do E91s (and E90s?) suffer less from the inner tyre wear than E92/3s?

Hoping the consensus / answer is E90/1 have very few inner tyre wear issues!

Cheers

[dxb335d]

I rekon the E91 will have less Camber due to having to take potential weight in the back.

[flood51]

Yesterday the tyre warning came on, I got a flat in my near side rear. Tried to get it repaired first but apparently you can't so I ordered two new rear tyres as I only had 3.75 mm left (16000 miles) on the tread. When the guy took the tyres off he pointed out the puncture which was where the inside edge had worn down so much it caused the puncture. The other tyre had similar wear. I have included a photo.

The wear in the inside is not immediately obvious when the tyre is on the car. No idea what causes this uneven wear but it must be something to do withe the way BMW set up the rear end. Fronts don't exhibit the same problem.

Flood