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03-04-2013, 10:45 AM | #23 |
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Geez, I have run through 2 sets of these NT01's in the past and was just about ready to order another set this week. Now this thread has me a little worried..... guess i should look around and perhaps try another tire.
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03-04-2013, 10:47 AM | #24 |
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This is what mine looks like... any thoughts?
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03-04-2013, 11:17 AM | #26 | |
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I'm not using Nittos, but several friends are, so I'm interested to figure out: Is this a batch issue, or is this caused by something else.
For example, http://www.ehow.com/list_7508798_pro...tto-tires.html states: Quote:
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03-04-2013, 11:19 AM | #27 | |
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03-04-2013, 11:34 AM | #28 |
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Mine first appeared on left front and right rear. Now it is apparent on all four. As the treads are wearing, they are now less noticable. I think it depends on what level the treads are worn to. I spoke to several people that I track with and they also had the same issue with the NT01's. One person had a large chunk delaminate and had to replace tire. I only have about 4-8 sessions remaining on mine. Not sure what I will replace them with.
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03-04-2013, 12:32 PM | #29 |
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I doubt it has anything to do with the glass transition temperature of the rubber (i.e. exposure to cold temperatures). This is a tread splice failure issue, and the Tglass exposure issue would show up in many places on the rubber (i.e. see the pictures Toyo shows of an R888 exposed to cold temperatures in their warning document).
In my case, my tires were built in week 32 last year if I recall correctly (late July sometime), and I purchased them in late October.
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03-04-2013, 01:30 PM | #30 | |
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Quote:
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03-04-2013, 02:02 PM | #31 |
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I couldn't either, so I bought a set of 245/40-18s and ran those all around yesterday. I'm waiting on the 275/35s but that won't be until June. As it is, I'm astonished at the grip and performance of the 245/40s yesterday. Also note the Rival is almost section width wide out to the tread face; hence something like a 245 Rival has a tread width similar to a typical 255. So check clearances carefully... I hope to get the 275s prior to the first part of June, but as it looks that is just hope for now.
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03-04-2013, 03:38 PM | #33 |
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My first one was on front drivers side, second was rear passengers side, third I don't know.
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03-04-2013, 05:50 PM | #34 | |
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03-04-2013, 06:07 PM | #35 |
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Quick update. I just got off the phone with nitto and the replacement seems like a hassle. I have to bring it to a nearby authorized dealer (that may or may not want to help me since I didn't buy the tires from them). I'll have to buy a new tire and pay for mounting and shaving so it matches my other 3 tires. Meanwhile the tire will be sent back to nitto for a measurement to determine proration of my refund. I'm guessing that a prorated used race tire will not be worth much.
I'll likely just keep running them and monitor the tread. Right now I'm not overly concerned about their safety. |
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03-04-2013, 06:15 PM | #36 | |
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03-04-2013, 07:14 PM | #38 |
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From what I can gather, if you got'em thru a tire shop or chain whose policy is to refund you right away (like Discount Tire), then they'll do that and deal with Nitto to get reimbursed. But, if you bought'em from a smaller/local shop like I did, wherein they don't have a policy to refund you right away, then you have to deal with Nitto directly and go thru that long process and the most you can expect is the prorated refund based on the amount of remaining tread.
After the discovery of the first splice, I had another track day the following weekend, so I bought a new one and put the spliced one thru the warranty process. Then, over next 2 track days, 2 more tires developed splice. It's been a long process with the first one, and I still don't see the end of it, so I'm debating whether to put the other 2 thru this process, or just put them back on and track them on slower speed tracks.
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03-04-2013, 09:27 PM | #39 | |
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i ran mine looking worse than that picture with no issues to date.
Quote:
looks like no consitency of where it happens on the car. sidewall indicates week of the year produced as well. wonder if its all one run or from various ones.
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03-04-2013, 09:30 PM | #40 |
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My other 3 are looking good right now and I only have 1 day on the tires, so I'll get DT to replace the one, and let the others ride. Hopefully by the time I get a new set this issue has been resolved.
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03-04-2013, 10:03 PM | #41 |
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This is happening to my new NT01s (one track day) as well. I have had more than 10 sets and have never had this issue. Sounds like they have changed their design.
I guess I have to switch to another brand. Too bad I like the tire and have used it for years
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03-05-2013, 05:13 AM | #42 |
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Those who continue to use tires with tread splices that are compromised while simply saying "nothing has happened yet" is not a valid solution for most HPDE programs or track events. You are choosing to put yourself and all those around you on track at increased risk, a risk that is known but with a widely variable range of occurrence. It's similar to loading a member of a structure beyond its yield point (resulting in unseen minor plastic deformation), hearing engineers warning you not to do so, observing that the structure is "still standing and working 'fine'", and therefore continue loading that structure in the same manner.
At least in this case of the tread splice gaping open, if the worst case risks are realized, the failure analysis will be simple. Note that you will most likely be liable for the outcome, legally, especially since you chose to continue to use the tire in the degrading condition. Simply getting on track with most programs will require hiding the tire's condition from tech inspectors. I can't fathom getting into a student's car with said student knowing of an impending tread splice failure but who has decided not to worry about it since "nothing has happened yet."
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03-05-2013, 05:43 AM | #43 |
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Some Pics
This splicing issue happened to one out of four tires purchased at the same time. It isn't deep but concerning nonetheless.
Freezing temps aren't an issue for my location. The idea that only one tire had this issue makes me think Nitto may have a manufacturing issue/quality control issue. I have used these tires for several years now and splicing has never been an issue. Third set for the M3 and this is the first time I've had this issue. NT01s have been bullet-proof up to this point, but I guess all good things come to an end eventually.
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