Old topic revisited: worn tires (pic)

I have a brand new unused set of tires. I have a 2 day DE at Mid-ohio coming up. Here's my current left rear tire. Based on previous wear, I dont' think it will cord at the end of 2 days DE. New tires will squirm and chunk, ruining them. What do you all think? Are these still safe, or just use the new tires.

Don't tell me you're going to shave your new tires. Go with the old...slicks always have more grip.

I would definitely use the old ones - still above the tread wear indicator. The trick will be to watch the pressures as always...

Looks like there is still plenty of tread and should be fine. Before never saw the old ones but the scan you have shows plenty for 2 days worth of DE's. Also you won't have to adjust to the new ones which in the beginning is quite edgy. Have fun dude and lmk when you going to get to California and do Laguna Seca-I'll go too : ). Regards. Mike

Use it but be careful. Looks to me like the inside is already on the wear bar. This is where the tyre goes first so you've got to watch it carefully. The cord is not very far below this on the very inside edge of the tyre (I know). S.

Thanks for the replies, all. I'll break in the new tires, just in case, and still use the old tires for the track. Anything happens, I'll let y'all know, with pics!!

The wear bars are at 2/32" of the 10 that most tires come with, i believe. jason

Age of the tire also plays a big part. My Pilot MXX3's with low but adequate tread would easily break loose from a roll at 30 mph. When I put on a new set it felt like I had lost 100 hp as my car gripped much better and would not break loose from a roll. How old are your current tires? If they are getting old the new tires may offer you more grip.

This is not the part of the tire you should be showing us....We need to see the edges near the side wall!!!! Unless you screw up your preasures you will never wear out a set of tires on the track across the tread!!!! You will burn the outside edges fater (less if you have a good amount of camber). Best thing you could doo is if your going to the same track as your last DE...which means you will wear the same way...is to have your tires flipped on the rims (if they are directional and then swap sides. This way they wil all cook evenly :-) Most trackes I have driven seem to be heavy to left or right based on the long tight bend high speed sweepers..those as the real tires killers. So watch your preasures and flip them and you might be ok...might even get another event :-) <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

[quote]Originally posted by Armando Ramirez: <strong>This is not the part of the tire you should be showing us....We need to see the edges near the side wall!!!! Unless you screw up your preasures you will never wear out a set of tires on the track across the tread!!!! You will burn the outside edges fater (less if you have a good amount of camber). Best thing you could doo is if your going to the same track as your last DE...which means you will wear the same way...is to have your tires flipped on the rims (if they are directional and then swap sides. This way they wil all cook evenly :-) Most trackes I have driven seem to be heavy to left or right based on the long tight bend high speed sweepers..those as the real tires killers. So watch your preasures and flip them and you might be ok...might even get another event :-) <img src="graemlins/burnout.gif" border="0" alt="[burnout]" /> </strong><hr></blockquote> Amando, Not sure I agree with this. 1) my experience is that it is almost always the inside of the tyre that goes first. This is because of the negative cambre. 2) swapping tyres like you suggest is a big no-no. The tyres become directional once they have been on the car for a little while so you cannot just swap them left to right. The belts break in a certain way but also the tread wears to a certain pattern. Swapping tyres and maintaining directionality doesn't work either. There is an inside and outside to the tyre. But the even bigger problem with this is that the tyre doesn't wear evenly. if you swap them like you suggest then certain parts of the tyres will have more contact with the road than others. The temperatures will be higher in these parts. The traction won't be as good. Sometimes you just have to accept that you aren't going to be able to get every last ounce out of your tyres. S.

The outside shoulders are worn, but the inside treads are more worn. Plus, on the P-zero assims, the transverse cut on the outside tread blocks are not as deep as the other cuts, so they disappear but the tread is still not down to the wear bars on that side. All the tracks I've been to go clockwise, more right turns, that's why I showed you the rear left, the most worn tire. The right rear actually doesn't look so bad, particularly at the shoulders. I'm sorely tempted to switch sides. But the manual says it's a no-no, as Fixed wing states. Same thing with switching the tires on the rims. The tires are assimetric, with letlering that says internal on one side, and external on the other. In 4 languages, no less!! Thanks for the reply, though. As an update, I've put on the new set of wheels and tires, and took them out for a test run. Amazing what you don't pick up when it comes on slowly. The car had more vibration at speed, as well as a tendency to wander with the old tires. The new tires are definitely better at straight tracking, no vibration at all, quieter (aside from the first hundred feet where they literally were squeeking like rubber shoes ). And they are the same tires! Anyway, I'll break them in and keep them handy, and use the old tires at DE. Hopefully, I won't end with with fixed wing's tires!!!

[quote]Originally posted by Palting: <strong>... switching the tires on the rims. The tires are assimetric, with letlering that says internal on one side, and external on the other. In 4 languages, no less!!</strong><hr></blockquote> It seems tempting to do this once the tyre is well worn. After all, what difference can it make if there is no tread on the tyre? Someone I know did do this on a Porsche he had just purchased so as to even up the wear. He got a quick lesson in handling snap oversteer. We concluded after that the reason was that the tyre was now angled in relation to the road and therefore one side of it would be taking much more load than would the the other. The inside edge wears more quickly but after the tyre is swapped this is also the part of the tyre with the greatest amount of tread. The result would be as if the tyre was running on only this little bit. That's the theory at least. S.

OK guys..hard to get it all in words and not miss something ...my fault.... When I said flip tires on the rim that was only for directional tires...which means on a 911 you have (4) unique tires Front L & R....Rear L & R... If you flip them on the rims..then you can swap the rims left to right! That was part one... That I was not clear about..sorry And yes...you will feel it a bit strange until the tire levels out after some hard runs. But you'll get just about all you can out of your tires. With the Hoosiers I did not need to flip them on the rims..just go Left to right. I'm running P-Zero slicks now and then seem to have a rotation arrow (which makes no sense since there is no tread) but it might be due to construction. As far as wear on the insides due to camber....if you are talking about driving the tires day in day out on the street with 2 degrees of camber yes they will wear faster on the insides... My comment was based on just driving on the track. The only time you shoud have any load on the insides is when your going in straight line and tht does not compare to the load in a turn. The camber on the car is used so when you load up in a turn you get more tire on the road than when your going straight even with that you tend to drive the tire over near the side wall the inside of the tire has very little load on it. In fact the whole inside of the car is almost in the air (P-Car tend to even lift the front inside tire off the ground.) If you look at most of the High Pro tires the tread pattern does not exist on the outer 20-25% of the tire....that is the only part of the tire on the road in a turn. So If you are wearing you tires on the inside at the track check your preasures (or your at a track that only travles in straight lines :-) ) I'm not a know it all....but I have had my share of tire problems...depending on what you have the air will make a big diff!!! Old R1 used to get the groove of doom in the middle...P-zero-C would break up on the outer edges right before you would cord the outer 3 inches of the tire...talk about a surprise in a high speed sweeper..feels like your out on the marbles...nope just the tires falling apart.... I'll reread the comments and see if I missed any issues you guys raised with my original comment. Sorry to have confused any one if I did.

Sorry I will correct my self before any of you do...you guys threw something in and I heard it when I read it but did not pay attention... Yes you can have a set up where you can't flip and then go left to right...... Example: Rotation Forward inside.........inside Forward Rotation These can not be flipped and switched or you get either the rotation or the inside wrong. So in those case ignore what I said above. (it works for all the others..and you get more out of you tires...last 3 sets have gone all the way to the cloth under the rubber just above the cords...feels like running around in your socks :-)

[quote]Originally posted by Armando Ramirez: <strong>My comment was based on just driving on the track. The only time you shoud have any load on the insides is when your going in straight line and tht does not compare to the load in a turn.</strong><hr></blockquote> Yes, I thought this too. But then I could see that the wear rate on the inside continued to be pretty heavy even on the track. I finally came to the conclusion that the tyre is wearing the inside mostly when it is the inside wheel in a corner. I think what is happening is that the car is rolling the other way and the inside wheel is extending a little. This puts the inside of the tread more in contact with the road. Yes, the outside tyre is taking more of the load but there is still some load on the inside tyre. As the tyre slides and is mostly on the inside of the tread the wear rate is much heavier here. Confusing but read the paragraph a dozen times and I am sure it will become clear. This is the only theory that I could see that would explain what I was seeing. Not sure if it is really true though. S.