Michelin Cup threadbare on inside F/NS!

Pip1968 · 07-10-2013, 08:03 PM

Well I still have three laps left of my twenty five as the Nordschleife closed an hour early today due to another accident. They will be for sale should anyone be interested (3 laps for £35).

More importantly I changed my Cups back to PS2/ Michelin Super sports for the journey home and to my dismay found the inner near side front tyre worn to the canvas (only the inside inch or so). Something has obviously caused some serious rubbing. There did not seem to be any play in the wheel so presumably not the ball joint. Steering? Any ideas appreciated. She is going to ELMs on Wednesday so perhaps it will be obvious to them.

Pip

**shimmy** · 07-10-2013, 08:11 PM

Toe or worn bush

_Nathan_ · 07-10-2013, 08:17 PM

Yep, too much toe out will do that.

Pip1968 · 08-10-2013, 11:18 PM

Well I made it back to Blighty with a wheel change for the route back and do not seem to have suffered the same excessive wear but will get her checked at ELMs tomorrow. Thank you for the prompt replies.

By the way Shimmy I met your mate John Stevenson at the Lindner with his lovely and much used 996 GT3 RS.

**shimmy** · 08-10-2013, 11:19 PM

Stevo is a star.

And plenty of tread left on that there tyre.

s.mac · 09-10-2013, 02:32 PM

You need to check the 4 wheel alignment, that's not good on a tyre with that much tread on

cslsuperfan · 10-10-2013, 01:11 AM

Quote:

Originally Posted by Pip1968

Well I made it back to Blighty with a wheel change for the route back and do not seem to have suffered the same excessive wear but will get her checked at ELMs tomorrow. Thank you for the prompt replies.

By the way Shimmy I met your mate John Stevenson at the Lindner with his lovely and much used 996 GT3 RS.

Pip I had the very same tyre damage on a front set of cups a few years back. BMW diagnosed seized control arms on both sides. Replaced both arms and had a full kds alignment. Never re-occurred...however my car hadn't done 22 laps of the ring!

Pip1968 · 11-10-2013, 10:31 AM

As said the road tyres do not seem to have suffered on the 300 mile journey back home so I am thinking that maybe the situation was exacerbated/caused by low tyre pressure.

When I changed the PS2s to Cups just down from Am Tiergarten I did not tyre check pressures. I then started lapping with short breaks and came in after doing probably nine laps that day. I decided to give her a rest and a chance to cool down and check tyre pressures. The NSF was at 20psi I seem to remember whilst the others were happily at 30psi. I pumped it back up and did not think anymore of it. Luckily it was 1800 and the Nordschleife coincidentally announced that they would not reopen for the last hour due to an ongoing incident. It was only then as I swapped the tyres back for the journey home that I saw the damage/wear.

I may get KDS done anyway. Anyway, surely Giraffe would have noticed the control arms (apologize for my ignorance - I only dabble in mechanics) especially as I told them at ELMs about the excessive wear NSF.

Pip

northernjim · 09-10-2013, 07:55 PM

Quote:

Originally Posted by _Nathan_

Yep, too much toe out will do that.

2mm toe out and 2.5and over camber will ruin a tyre on the road in quick time

Pip1968 · 09-10-2013, 09:28 PM

Rather unashamedly although I have Turner adjustable top mounts I have not adjusted her toe in/out for track, she is presumably completely neutral. Giraffe looked at her today but only came up with the front the coil springs being incorrectly seated. Would that have caused the excessive wear and on one side only - ??? I am not convinced.

On top of that I can only add two other points. Firstly the coil springs have either been like that since I bought her 11,000 miles ago (mostly track and travel to and from - only Nordschleife) and without a similar problem before. Secondly BMW Maidstone looked at my suspension although this was due to the car sitting unevenly and the problem was at the rear so presumably they did not dismantle and reconstruct the front suspension.

I did ask BMW to look at the bushes et cetera with a note of the problems encountered.

Finally I should add that I did ride the curbs at Hatzenback, just before Adenau, and at Eschbach and on the uphill left after Brunchen. Maybe it was that.

Pip

07-10-2013, 08:03 PM	#1
Pip1968 S5, Sport Off, DSC M-track Join Date: Dec 2007 Location: Kent, England Posts: 940 Casino cash: $8383	Michelin Cup threadbare on inside F/NS! Well I still have three laps left of my twenty five as the Nordschleife closed an hour early today due to another accident. They will be for sale should anyone be interested (3 laps for £35). More importantly I changed my Cups back to PS2/ Michelin Super sports for the journey home and to my dismay found the inner near side front tyre worn to the canvas (only the inside inch or so). Something has obviously caused some serious rubbing. There did not seem to be any play in the wheel so presumably not the ball joint. Steering? Any ideas appreciated. She is going to ELMs on Wednesday so perhaps it will be obvious to them. Pip

07-10-2013, 08:11 PM	#2
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	Toe or worn bush __________________ .

07-10-2013, 08:17 PM	#3
_Nathan_ Driving it like I nicked it Join Date: Sep 2008 Posts: 2,099 Casino cash: $13060	Yep, too much toe out will do that. __________________ Nathan

08-10-2013, 11:19 PM	#5
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	Stevo is a star. And plenty of tread left on that there tyre. __________________ .

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09-10-2013, 02:32 PM	#6
s.mac CSL Register Uber-poster! Join Date: Jun 2008 Posts: 4,247 Casino cash: $15600	You need to check the 4 wheel alignment, that's not good on a tyre with that much tread on

11-10-2013, 10:31 AM	#8
Pip1968 S5, Sport Off, DSC M-track Join Date: Dec 2007 Location: Kent, England Posts: 940 Casino cash: $8383	As said the road tyres do not seem to have suffered on the 300 mile journey back home so I am thinking that maybe the situation was exacerbated/caused by low tyre pressure. When I changed the PS2s to Cups just down from Am Tiergarten I did not tyre check pressures. I then started lapping with short breaks and came in after doing probably nine laps that day. I decided to give her a rest and a chance to cool down and check tyre pressures. The NSF was at 20psi I seem to remember whilst the others were happily at 30psi. I pumped it back up and did not think anymore of it. Luckily it was 1800 and the Nordschleife coincidentally announced that they would not reopen for the last hour due to an ongoing incident. It was only then as I swapped the tyres back for the journey home that I saw the damage/wear. I may get KDS done anyway. Anyway, surely Giraffe would have noticed the control arms (apologize for my ignorance - I only dabble in mechanics) especially as I told them at ELMs about the excessive wear NSF. Pip

09-10-2013, 09:28 PM	#10
Pip1968 S5, Sport Off, DSC M-track Join Date: Dec 2007 Location: Kent, England Posts: 940 Casino cash: $8383	Rather unashamedly although I have Turner adjustable top mounts I have not adjusted her toe in/out for track, she is presumably completely neutral. Giraffe looked at her today but only came up with the front the coil springs being incorrectly seated. Would that have caused the excessive wear and on one side only - ??? I am not convinced. On top of that I can only add two other points. Firstly the coil springs have either been like that since I bought her 11,000 miles ago (mostly track and travel to and from - only Nordschleife) and without a similar problem before. Secondly BMW Maidstone looked at my suspension although this was due to the car sitting unevenly and the problem was at the rear so presumably they did not dismantle and reconstruct the front suspension. I did ask BMW to look at the bushes et cetera with a note of the problems encountered. Finally I should add that I did ride the curbs at Hatzenback, just before Adenau, and at Eschbach and on the uphill left after Brunchen. Maybe it was that. Pip