Coochas

I believe it is a bead wire. This was at least 7 years ago I think. The tires were mounted by Tire Rack!

cre8fun

Thanks for the confirmation. I talked to a couple other people who've seen this, but did not know if it was an oddity or the norm for recently made Hoosiers. I think it's becoming the norm and it's making me think about switching to Pirelli's till I don't hear about it anymore. I've run 3 pair like this till they were done and there are 2 pair on the car, same patterns, but I have to say, it makes me trash them earlier than I normally would and it does linger in the back of my mind while on track. As they get closer to done, it really does seem like the tread wants to come off the carcass and I did that last year going into the bus stop at Watkins. I got off easy in that one, body damage, but I was fine, certainly not really interested in doing that again.

mark kibort

that makes sense (the wear indicated on the tire tire before flipped) and you seem to be inline with pressure. most of us, including the very fastest corvettes, are running about 30psi hot as well (i think 28 might be alittle low) but maybe the 38 psi and the weight of the car is too much for the tire right out of the gate and it starts to delaminate. not sure. my experience is mostly A7s and A6s so i dont know if my experience is completely relevant.

mark kibort

have you tried the A6s (EDIT CORRECTION FOR MATT.... I meant to type, "A7"s ) sorry! ... they might be slightly faster, and seem to heat cycle out before they actually wear out. dont know the difference in the construction but a great number of us are NOT seeing this kind of failure on tires being used on cars as heavy and configured similar to our cars...

Matt Romanowski

How many years ago did Hoosier stop making A6 tires? You need to stop giving advice like this.

mmuller

Guess its time to post the link to Hoosier's tech note on how to car for A7 and R7 tires ---> http://www.hoosiertire.com/images/co...s/TCTR7_A7.pdf

The highlights -

• Cars over 3000 pounds should run 36-40+ hot. Hoosier states the tire may 'feel' better at lower pressure but damage is occurring to the tire.
• Morning temps below 60F require even more pressure than the stated cold pressure's
• Never lower the tire back down to the cold pressure's. For a 3000+ car they should START at 30-34

People run these tires with to lower pressure in them and then damage them and expect Hoosier to pick up the tab. If your not using the pressure's Hoosier states is required you will damage the tires, period

mark kibort

Com'mon, you know i was referencing the the A7s. i even provided a picture of them.........dont be such a dxxk

cre8fun

since I started the thread, I'll be clear. Thanks for the info. I get what Hoosier says and I acknowledge that there's a big difference between what Hoosier "recommends" and what the majority of their users do in terms of pressures they run. (I've actually had friends talk to Hoosier engineers at the track and question them on their printed pressures and those engineers have essentially said they quote them high for CYA and to increase tread longevity.)

I've never asked Hoosier to pick up the tab for anything.

the point of the thread is that I have noticed that every tire I've gotten with a build date later than mid-2017 has exhibited a strange and a little disturbing groove pattern on the inner and outer edge of the tires (front and back). In my case, I've run the tires to completion without them blowing apart, but I've not seen that patterning in previous years and it's a little disconcerting. so I was looking to see if others are seeing it also. my guess is that Hoosier changed something in the manufacturing process and if it continues, I will likely switch brands for a while. Just looking for feedback from others running Hoosiers.

Paul Solk

Same here... It's been consistent all year. NJMP by far the worst

mmuller

My post was not directed at anyone person, but rather anyone using lower pressure's than what is recommended. I use the recommended pressure's, always have. I personally don't see these issue's and neither do my customers that run the correct pressure's. I have customers that choose not to use the correct pressure's and constantly see issues with their tires, just like these issue's here and other issue's. The moral of the story is, use as intended to get intended results. Anything other than that is liable to fail as you and others have experienced.

So, to add to your data point, I have 5 cars running Hoosiers that are fast enough drivers to use the tire and not experience this issue in about 30 sets of tires this year so far. of the 3 that choose to do their own thing, they have had 5-8 tire failure's.

Paul Solk

So I've never had a failure and I've never changed my starting pressures or hot pressures but this behavior is new to the point I asked my guys to check for a rub as well... That's what it looks like but its almost like there is a seam there for the sidewall... Like they started gluing the sidewalls on differently.

mmuller

That has not been our experience.

Paul Solk

I'll try my next set at 30 cold but shooting for 36-38 hot in a 3150 pound car at places like VIR and NJMP means 30 cold is really tough. Anything above 38 in my car and the rear end is all over the place and 30 cold brings me in at 44 hot by the end of a Sprint race... By the second or 3rd session we are 28 cold 36 hot.

I'll totally admit we are well below 30 cold on mine so cold tearing is possible but will also say it hasn't affected the longevity or cycles on any of my sets either. It's just something we noticed but ignore.

cre8fun

Bingo - that was my thought the first time I saw it and I continue to think there's a seam opening, and furthermore, this behavior seems new. I've only seen it on tires made since mid-'17. In the C5 corvette community, people have been running 28 hot for a LONG time and this grooving/cracking has not occurred BUT now it is. So something has changed and that leads me to a decision - run high pressures and ice skate on track, or switch to a different brand till this goes away.

And to MMuller's point - THAT'S GREAT DATA! he's saying that he's seeing people who run them at high pressures and they don't see these issues. then he has a minority running low pressures and they are having problems. that's actually great data. maybe Hoosier made a changes such that the tire can NO LONGER tolerate low pressure running.

I set out to see if my experience (RECENT Hoosiers are behaving differently) was unique to me or more wide spread. from this thread and threads in other communities, it seems the tires are behaving differently. so until that changes, I have a decision to make.

mark kibort

i think the size and the weight of the vet might make your comparison a stretch to find confidence in the correlation. we havent seen these issues on the R7s or A7s with 30+ sets this seasons on cars that are fast and running over 3000lbs. maybe it was just an isolated issue but for all 4 tires, it makes me think of pressure or set up. could have been just those 4 tires....... i dont know, but i know all the tires we have used in our group (like i said 30 + sets) no on has had any issues running at between 30 and 33 hot.