You ever see R comps do this?
#1
Burning Brakes
Thread Starter
You ever see R comps do this?
About a week ago I found one of my V710s had a cut on the corner of the tread. I figured that during the winter one of the snow shovels or a garden spade or some other deadly yard implement had fallen against my stack of tires and cut it. All the tires have a lot of tread left so I was irritated but it's not the end of the world.
Well since then I've found two more tires have the same thing! And one of those tires was on the car and should never have tangled with said deadly yard implement.
I bought the tires in late 08 and ran a couple of track sessions on them. Used them for only 3 track sessions in '09.
Below are some pics of the first tire I found but the other two look quite similar but vary in length. Two have them on the inside edge and one one the outside edge.
Has anyone ever seen or heard of anything like this?
Well since then I've found two more tires have the same thing! And one of those tires was on the car and should never have tangled with said deadly yard implement.
I bought the tires in late 08 and ran a couple of track sessions on them. Used them for only 3 track sessions in '09.
Below are some pics of the first tire I found but the other two look quite similar but vary in length. Two have them on the inside edge and one one the outside edge.
Has anyone ever seen or heard of anything like this?
#2
Safety Car
http://forums.corvetteforum.com/1546965665-post7.html
Search for "v710 splice" or "v710 seam" or "v710 has anybody seen this?" :-)
Search for "v710 splice" or "v710 seam" or "v710 has anybody seen this?" :-)
#3
Burning Brakes
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Search kumho butt splice seam.
In most cases if you run the tire in the other direction - change them side to side - it will not get any worse, and it does not effect the tires performance.
In most cases if you run the tire in the other direction - change them side to side - it will not get any worse, and it does not effect the tires performance.
#4
Burning Brakes
Thread Starter
Was just pointed to the section below from the Tirerack website.
Tire Inspections Between Sessions
Tire inspections between sessions should be used to remove all rubber pickup from the wheels and tire treads, as well as offer an opportunity to examine the tires for punctures or cuts that might lead to compound tearing or air pressure loss. The inspection should also confirm if each tire's tread compound splice (that runs perpendicular to the direction of travel across the tread area) has become visible.
A visible tread splice is caused by tearing open the tread compound junction at the tread splice. Visible tread splices are caused by the torque of the engine spinning the tires during acceleration or the stopping power of the brakes briefly sliding the tires when slowing from high speeds. Front-wheel drive and most all-wheel drive vehicles place extreme stress on the front tires from both acceleration and braking forces, and are therefore more likely to see these visible signs of use than more balanced rear wheel drive vehicles.
If a visible tread splice is detected during tire inspections, the tire should be rotated side-to-side on the same axle. This will then use the vehicle's wheel spin to "close" the splice rather than continuing to "open" it. While this may cause the tread splice to become visible on the other tire used on the same axle, the inspections and side-to-side rotations should be repeated until the tire has worn out.
NOTE: Continued use of a tire with a visible tread splice in the same wheel position will cause the tread compound to tear downstream from the splice, forcing the tire to be removed from service.
The tires on very high horsepower cars should be rotated side-to-side between every session as preventative maintenance.
Tire Inspections Between Sessions
Tire inspections between sessions should be used to remove all rubber pickup from the wheels and tire treads, as well as offer an opportunity to examine the tires for punctures or cuts that might lead to compound tearing or air pressure loss. The inspection should also confirm if each tire's tread compound splice (that runs perpendicular to the direction of travel across the tread area) has become visible.
A visible tread splice is caused by tearing open the tread compound junction at the tread splice. Visible tread splices are caused by the torque of the engine spinning the tires during acceleration or the stopping power of the brakes briefly sliding the tires when slowing from high speeds. Front-wheel drive and most all-wheel drive vehicles place extreme stress on the front tires from both acceleration and braking forces, and are therefore more likely to see these visible signs of use than more balanced rear wheel drive vehicles.
If a visible tread splice is detected during tire inspections, the tire should be rotated side-to-side on the same axle. This will then use the vehicle's wheel spin to "close" the splice rather than continuing to "open" it. While this may cause the tread splice to become visible on the other tire used on the same axle, the inspections and side-to-side rotations should be repeated until the tire has worn out.
NOTE: Continued use of a tire with a visible tread splice in the same wheel position will cause the tread compound to tear downstream from the splice, forcing the tire to be removed from service.
The tires on very high horsepower cars should be rotated side-to-side between every session as preventative maintenance.
#5
Drifting
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You aren't alone, my Khumo's are doing it too. I rotated the tires per the tirerack instructions prior to my last outing and the split hasn't worsened. Tires are still sticky too!
#6
Tech Contributor
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I agree with all that has been said about swapping the tires from side to side. However, some times that tread comes apart quicker than you would think. I purchased 4 V710s in August 2007 and used them at an autocross within a week of getting the tires. During the autocross one of the tires split at the tread splice and actually peeled off a section of tread. That was on a Sunday and the next day I was on the phone with Tire Rack. They warrantied the tire and sent me a replacement.
Bill
Bill
#9
Burning Brakes
Thread Starter
I don't know if it's unique to Kumho but it does seem to be a known issue. Most of the feedback I've gotten (here and on the forums of two clubs that I run with) are that the side to side or diagonal rotation of the tires between sessions helps keep it from worsening.
I'll check into a warranty but won't hold my breath for that one. I've been a huge Kumho fan but this may change my mind.
I'll check into a warranty but won't hold my breath for that one. I've been a huge Kumho fan but this may change my mind.
#10
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There was an issue with cracking on newish tires a couple of years ago (I think it was Kumho). The excuse I heard from Tire Rack was that the tires hadn't been stored properly and had been subjected to too many freeze/thaw cycles during storage. I don't under stand the physics behind it, but that's what I heard (and TR warrantied them). Could be
#12
Safety Car
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I have the same splice showing on a brand new set of V710 Kumho's that have been used only at one event. Nothing to worry about, run the snot out of the tire. I have had splices that have shown 3-5 inches long across the flat tire surface and run them without problem. Just watch it between sessions and if it starts growing dramatically, rotate the tires. I usually just rotate side to side after every event. This is a known occurrence with Kumhos.
#14
Le Mans Master
Don't enjoy dealing with it, but it's not a big issue.
HTH, and have a good one,
Mike
#16
Race Director
Almost every 710 I have run does this, often all the way across. I rotate & flip a LOT and I only had one that really opened up and peeled. Did not get any warranty satisfaction on it (Discount Tire).
#18
Burning Brakes
Thread Starter
#20
Le Mans Master
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you better not use that tire. sell it to me for 10 bucks and you won't have to worry about it
About a week ago I found one of my V710s had a cut on the corner of the tread. I figured that during the winter one of the snow shovels or a garden spade or some other deadly yard implement had fallen against my stack of tires and cut it. All the tires have a lot of tread left so I was irritated but it's not the end of the world.
Well since then I've found two more tires have the same thing! And one of those tires was on the car and should never have tangled with said deadly yard implement.
I bought the tires in late 08 and ran a couple of track sessions on them. Used them for only 3 track sessions in '09.
Below are some pics of the first tire I found but the other two look quite similar but vary in length. Two have them on the inside edge and one one the outside edge.
Has anyone ever seen or heard of anything like this?
Well since then I've found two more tires have the same thing! And one of those tires was on the car and should never have tangled with said deadly yard implement.
I bought the tires in late 08 and ran a couple of track sessions on them. Used them for only 3 track sessions in '09.
Below are some pics of the first tire I found but the other two look quite similar but vary in length. Two have them on the inside edge and one one the outside edge.
Has anyone ever seen or heard of anything like this?