Rob P

I have a set of kumho v710's still lots of life on them but after tracking the car I noticed these lines on all 4 tires. It's where the rubber is mounted from the manufacturer.

Is this normal?
Is it fine to still take these on track?

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Bill Dearborn

Normal for Kumhos. That is the splice joint where the band of rubber that wraps around the carcass meets. Most likely yours are coming apart due to hard braking. I always swapped the tires from one side of the car to the other with each usage. That tends to keep the joint together. I had some new Kumhos about 4 years ago that actually peeled a section of tread off the tire starting at that seam. They warrantied that for me but they will not warranty what is shown in those pictures.

Bill

sperkins

I wouldn't run them. Looks like a separation waiting to happen.
What are the date codes?

Rob P

date code is 4306

safety is my concern, i don't want to be 150mps and the tires peels on me.

So, it looks like you guys are saying not to run them correct?

Solofast

Just flip them from side to side and they will be fine. It's normal for Kumho's. If you flip them they won't get any worse.

froggy47

They all do that, fronts under braking, rears acceleration. Kumho do seem to be the only tire maker that cannot butt splice, but just reverse direction every event & should be fine.

Every set I have run has shown the splice, one (out of dozens) came apart a little.

Mark a place on the sidewall that corresponds to the splice & then check each session.

You might even reverse them during the lunch break.

Rob P

Glad to hear reversing them should be fine. I would hate to have had to toss them already.

Thanks for the quick responses

rmackintosh

When I ran Kumhos the tread splice always appeared in that way. Just rotate them appropriately and don't worry unless you see the splice coming "up" more.

GettReal

Hey Rob, I thought you sold the Z?