Got my trade in from Kumho on my v710's great service! Ran my victoracers one day at RA and they are coming apart just like the v710's did! Is it me, or is something still wrong here? Take a look at this pic and let me know what you think.
Sorry for the big pic, didn't know it wouldn't automatically resize.

Are you sure it's coming apart? It is hard to tell from that pic, but it almost looks like it "slid" across something sharp (odd to see it in that straight of a line though). How are your tire temps? The wear does not look real even to me (like more camber is needed?). How are the other 3 tires?

I have had a few sets of Victoracers do the same thing. I think it is a somewhat common problem with the 315 size.

A Hoosier I had for autoxing years ago did the same thing, but it was from running over something. I'd suspect the same thing here, but Neil's comment intrigues me. I've been through about 8 of the 315 Kumhos and have never seen something like this.

Hey trackbird! The wear looks uneven because the grooves on the left side of the tire (outside) are not as deep as the ones in the middle and are therefore gone. Wear was pretty even, temps looked even across the tire.

That is no cut, I had the same thing happen on my v710's the tire is coming apart. From what I've heard so far from here and other boards , this happens from time to time

i have seen seveal sets like this. even in the 275 size i've seen it. from what i've seen, its normal. i have also never seen a tire that is doing that fail. send that pic to Kuhmo and see what they say.

Here is a pic of my v710's I though that this was what caused the recall, maybe I am misinformed??

I'm aware of that. I was trying to reference from the "wear holes" and thought they looked a little "off". But, I've been wrong before.....

Trackbird, you are right they are not totally even, probably could use more camber. I ran these tires on my z06 rear which has -1.0 camber. Never had a problem wearing the rear outside edge.

thanks for your input!

Tim

i don't think the 710's were recalled for what you took a pic of there. i think the 710's accually were separating from the belting.

That line is normal. It is the butt splice of where the tread is joined to itself after wrapping around the tire. The 710's were recalled for the tread comming off the carcass, not the butt splice. The Kuhmo's were originally marked left and right side to take some of the "pressure" off that butt splice. But they came to find out that it held up OK, and it therefore didn't matter what side of the car a particular tire was on.

This was a problem about 4 years ago with the Hoosier A3SO2 tires. The butt splice came apart and started taking the tread off the carcass. They sold the remaining stock for about 40% off when it appeared.

George E.

that wear looks normal to me


but my brother did just have a victoracer shread apart after 19 runs.. it doesn't look like normal wear at all.. it's worn down to the cord in about 10 places....

we're currently trying to get a replacement tire... the other 3 tires are wearing normally

I have the same "split" in my 315s and have had numerous people, whom I trust, tell me that this is normal, common and of no concern.

I ran a set like that till the wear bars were gone w/o an issue. So, I tend to believe it ...

Geoege hit it on the head. It's the splice, just run it in the right direction so the overlap doesn't get peeled up by hitting the ground. I don't know how to explain it properly................... And/or run them on the front so wheelspin doesn't make it worse and you should be just fine. LOTS of tires do that from more than just Kumho. Shouldn't, but do.

I'm guessing that the reason that race tires do this is because they are not cured nearly as long as road tires. Road tires are baked much longer (to make them harder), therefore the rubber sticks together much more. However, because a race tire is so soft (small chunks tear more easily, resulting in increased traction), I would guess that they are MUCH more succeptable to the tread separating also.

From the picture it is definitely a tread splice line. The splice when the tire is made is on an angle. Changing the direction of rotation on the tire should prevent it from getting worse. I had the same thing happen this weekend on my left rear tire. A little too agressive off the line with the tire rotating the wrong way. Remember the old Yoko A008R's with the A and B markings? That was the reason they did that, so you had the tread splices rotating the correct direction. By the way for braking you want the tread splice to be opposite of what the rears are rotating. It is rare however to open a splce under braking.

I used those Yoko’s on my Honda Civic. Yokohama recommended (for a front wheel drive car) that you reverse the normal orientation for the rear tires because the maximum torque they would see was under braking.

On a rear wheel drive car, would it not be appropriate to run the front tires “backwards” since the max torque they see is under braking?

That would be correct. On my Avons I just had 2 mounted with the Dot Numbers out and 2 with them inward. On the left rear the DOT is inward and the DOT is outward on the right rear. If you were concerned with the tractive forces on the front from braking you would mount them the opposite way. I'm going to run mine the same front and rear and not worry about the braking forces.