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Tyre Degradation

SteveJC

SteveJC

PCGB Member
Member
When I got home from the IOM trip on Monday I noticed the wear on my front tyres to the out side edge, the rears are unmarked but do have a lot more tread left on them
The tyres are Michelin 235/35/19 Pilot Sports with about 3 mil of tread left on the centre bands, they have not worn down to the wear bars.
I will drop it to the local tyre guy later in the week, but it looks like I need new fronts.
Is this normal when the tread gets so low ?.

Steve

491EB85A7D254DF8A393116FAAE3927A.jpg
 
I have never seen this on any of my tyres, even when in the old days I used to let them get very low.

How old are your tyres?
 
The front tyres are marked 07 and the rears 09, the car has done just under 15,000 miles so I presume the fronts are originals ,but I have no real idea on how long a set of tyres will / should last.
I have only had the car for 5 months and only done approx 1200 miles in it, and although this is my 3rd Porsche I,ve never had to buy new tyres.

steve
 
I'd of thought that was just abit of feathering on the outside edge, I've certainly seen mine in that shape after a hard driving day[:)]
The fronts I'd expect to get 16-20K from...

Tread depth is across the entire tyre of 75% of tread pattern, so I wouldn't worry about just the outside edge..
Best thing is to drop into the local tyre centre and ask their advice- one you trust and not just a quick mark me up type place [&:]

garyw
 
Agree with Gary, just looks like feathering on the outer edge after pushing on a bit. Track days have the same effect but a little more extreme. If you've got good depth over the body of the tyre you should be good, but with 15k in them they are getting near the end of their life.
 
Steve

Agree with previous comments - I regularly get this tyre of pattern on my tyres after a hard days use (especially if I am trying to keep up with Gary [:D]). It shows you've been working the tyres hard into corners.

At the IOM we are running much higher speeds than one would on the mainland and for sustained periods - this really does heat up the tyres so they are nice and sticky so they can feather when driven hard into corners (the outside edge/half of the front tyre is designed to do more work under hard cornering). You also get this regularly from track days along with embedded chunks of rubber from other cars tyres picked up by running over them on the circuit. So you can get this on fairly new tyres as well.

Again I tend to get 20-24k out of the fronts as I do a mixture of "proper driving" and motorway/A road schlepping - so at approx 15k miles from your tyres its probably worth going to a good tyre centre and getting the tyres checked with a view as to roughly how many more miles your tyres have in them. As per Gary's comments as long as over 75% of the tread pattern you exceed the minimum depth your OK.

Porsche do advise to change the tyres before they get to 1.5mm, there is some value there as research indicates that car breaking distances in the wet go up dramatically once the tread depth is under about 2.5mm

 
Sorry to be "au contraire" guys, but worn 3-plus year old boots on a C4S?? [:(]

Junk 'em, mate. They're bad news. [:mad:]

Invest in some decent wellies - you know it makes sense. [;)]

Regards,

Clive
 
absolutely agree-when my depth gets to 3mm i always change them,and usually notice the difference in grip straightaway.may be slightly OTT but has served me well so far
 
Yes, but this is probably as much to do with the improvement of rubber compound as an increase in tread depth (wet weather performance excepted, of course).

Best adhesion on dry surface roads is provided from slicks with no tread pattern whatsoever.

But tyre compounds harden as they get older, providing much less mechanical grip. They degradate more quickly too, since slip angle is increased and heat does not dissipate so quickly.

As I have suggested previously -bin 'em. [&:]

A lovely, powerful sports car deserves decent footware. [;)]

Regards,

Clive
 

ORIGINAL: Lancerlot

Yes, but this is probably as much to do with the improvement of rubber compound as an increase in tread depth (wet weather performance excepted, of course).

Best adhesion on dry surface roads is provided from slicks with no tread pattern whatsoever.

But tyre compounds harden as they get older, providing much less mechanical grip. They degradate more quickly too, since slip angle is increased and heat does not dissipate so quickly.

As I have suggested previously -bin 'em. [&:]

A lovely, powerful sports car deserves decent footware. [;)]

Regards,

Clive
Click to expand...


Any way Clive - I thought you changed the car before the tyres needed changing [:D]

Personally Clive, I agree with your view, if my tyres were 3 years old and on 3mm I'd change them but my comments needed to allow for differing views.

Clive is quite correct as older tyres compounds harden so dry weather grip drops off as well. But basically once you are under 3mm tread depth wet weather grip drops off dramatically with every 0.1mm, particularly when you droop under 2.5mm as I stated before.

If you have any doubts change them. If you can afford it its worth changing them now anyway.[:D]
 

ORIGINAL: okellyt
Any way Clive - I thought you changed the car before the tyres needed changing [:D]
Click to expand...

Tom,

Used to be when the ashtrays were full - but nobody smokes anymore![:D]

Regards,
Clive
 
Funny you should mention changing cars, Im going to test the new Targs 4S PDK on Saturday and a Gen 1 Turbo Tip so that will give me something to think about, mind you it saves buying new tyres.
If I don't change cars I will have new fronts next week.

Steve
 
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