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Tramlining and Tyre Choice

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AndyC

PCGB Member
Member
This is my first post in this forum and it seems a little mean spirited to do so by bringing up a subject that has been raised several times before. However, the earlier threads don't quite address the issue I'd like to ask for advice on.

I have a 993 C2S which is on Pirelli P Zero N3s which now need replacing. In common with quite a lot of posts by C2S owners with 18" rims the car has a tendency to tramline on non-smooth asphalt, particularly HGV-rutted dual carriageways and very bumpy roads. Which leads to consider switching tyres to see if this can make a difference. The local OPCs didn't offer much help (Reading said any would be fine, Swindon waxed lyrical about the Conti Sport 2 but when pushed said it was just more compliant).

Does anyone have experience of C2S and changes in behaviour caused by switches in tyres? I understand the N3s have been superseded by the Rosso N4s so in theory I have to make a change anyway and there seems to be as much chance of improving things as there is making things worse.

Any help greatly appreciated.
 
Hi andy,

biggest difference is switching to 17" ! I have a set of 18" running Cup sports and 17" running bridgestone SO2's and the difference in tramlining is night and day.

17" on bridestones is relaxing and 18" on Cups means you need to be very alert and ready to grab a tramline any any time.

Maybe try Bridgestones if they do them in 18"

HTH

John
 
John - I am wondering if your tramlining is made worse because you run the Cup Sports at a lower pressure than normal tires when on the road. I have Cup Sports on 17" wheels and have found a definate difference in tramlining between running them at 32 cold and 36 cold. At 32 they do it a lot but at 36 very little. I had droped them to 32 because this is the steer I got for these tires on the road but have gone back to 36 for now. But your original point is very valid. I have a set of 18s with Conti's on and find when these are on the car tramlines much worse then with any 17" setup.

Andy - As for the HGV comment unfortunaty our cars have a narrower track than most HGVs and as it is these that tend to wear the motorways most you find the car sitting in one rut or the other and jumping around whatever is on the car. Sorry I can't make any suggestions on 18" tires other than the Conti's on mine do it pretty bad so if Swindon wax lyrical about them then the others must be really bad. When was the last time the car had full aligment? 993s are very sensitive to this.

Ian.
 
I've always found that when the tyres are nearly new the tramlining reduces dramatically. Give them a couple of thousand miles and it's back. Same with SportContact 2's and P-Zero's, both of which I've had on my 993 and 996.
 
Pirellis seem worse for tramlining on the 996 models, and are really bad when they get near the end of their life (which in recent months seems to be reported as very, very short). SO2s were always the best tyre when the 993 was new, and should be a good choice still. Michline Pilots are less prone to tramlining (again 996 comments) and wear considerably better than the Pirellis.
 
On some roads my C4S is scary in the ruts or on the cambers. P Zero Rossos fitted but cannot comment on other tyres on this car. On my 964 switching from Contis to P Zeros made no difference.
 
Maurice - that is an outrageous stance. When I drove back from Eynsham I did virtually the whole M25 on the inside lane - there was no-one else in it...............

Richard
 
Dear All,

Thanks for the useful help. I thought about switching to 17" wheels but to be honest one of the reasons I have the C2S is I think it is possibly the best looking of the 911s (Hope I don't start an unintentional heated debate) and part of the Turbo Look is I feel the car looks much better on the bigger rims. The balance of the comments appear to support the idea of giving the Bridgestones a try so I'll give that a go and post the result.

p.s. I must work out how to tell the forum I am a PCGB member as it's still descibing me as a guest. You can tell I'm an amateur at this.
 
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