Tuesday, April 18, 2006 - 11:56 am, by: Gregg Holden(Xzotic)
Hey guys,
OK, I've just blown my second set of rear 19's in the space of about 6 months tops!
I'm interested to know what other people here run on in terms of 19's as I'm now seriously suspecting the brand/specs. Or if anyone else has any other ideas what might be going on then I'm open for suggestions! This is getting a tad expensive!!
Those of you who remember my thread a while back I posted up a blown Nangkang (drivers rear side) that happended on the freeway. It split on the inside tyre wall. After some investigation I found that the passengers rear side had splits on the inside also and was about to blow.
After some thinking I recalled that the suspension had been set up without the stereo system being reinstalled in the boot. I put down the two tyres as being impacted by incorrect camber once the full weight of the stereo gear had been put in the back (We are talking four large alpine amps, two subs, boxes and MDF for the amp stack). A bit of weight - but no spare tyre (Either before or after) - so nothing excessive.
So I bought two new Nangkangs of the same specs (265/30 ZR19 93Y). Well just 6 months on I had one blow on me again on a side street at low speeds last week. I was suspicious at first but when I took the tyre off I did see what looked like a noticeable hole in the tread (although not conclusive). The inner wall had again failed but I put that down to the fact that When rolling on it flat the inner wall goes first?
Putting this down to simply a nail puncture and rotten luck I went and ordered a replacement.... Now a week later, you guessed it the other one has now blown! Again inside wall, but again this may be the symptom of running on it flat.
Given that i've managed to blow two sets of back tyres whereas the fronts are fine with normal driving practices (plenty of tread still on the tyres that blew)...with apparent suspension being sorted (Although wilkinson suspension never actually told me how bad (if at all) the camber was out. I just assumed....which I know I should never do!
Anyway - it's driving me nuts now on what it could be. I can't see the boot having excessive weight over and above a normal boot with a spare and a load of stuff in there.
Or am I missing the point that the Nangkangs are simply crap...
Love to know what others (that have 19's) are rolling on...any help would be most appreciated!!
Tuesday, April 18, 2006 - 01:24 pm, by: Tamatha Chapman(4ltrv8)
What the???
Will be checking mine tonight, I run Nankangs and have had no issues. The current tyres have been on for nearly 1 1/2years. I too have a 'small' stereo, there is no spare tyre as I used this area to fill with box and subs, so I assume the weight would be similar to yours.
Maybe they are not giving you a quality product? Any chance of you checking the tyres before they get fitted? I am a little concerned for safety if you have already had two blow - not good. Could also be the settings on alignment are not being done correctly or even any rim damage?
I've been running in Nankang 20" on my fronts for 12 months without issues, and Falken 451 rears without any issues also. 38psi all the time. Perhaps (if you can afford it) to go for a Pirelli tyre next time, as they are warranted against manufacturing defects, and if there is a blowout due to sidewall failure, you should be able to claim it.
Tuesday, April 18, 2006 - 07:08 pm, by: John Street(Rex2ce)
I noticed a thread on here some time ago regarding the load rating of some " Falken " tyres, which had a load rating of 615 kg whereas Soarers apparently require tyres with a load rating of 650kg or more. Hope this helps
Tuesday, April 18, 2006 - 08:24 pm, by: Ben Socratous(Socrates)
I'm running TOYO tasw's all round in the 18" variety. Have had them for just over 2 years and about 35,000km, no issues whatsoever, still have about 35% tread left too!
Tuesday, April 18, 2006 - 09:45 pm, by: Gregg Holden(Xzotic)
Ok, thanks guys for all the replies on this very interesting...
Greg - what plate says 94y? - surely not the factory placard? I no longer have one so I can't check. 94 would be a slightly higher load rating requirement. The 93 is rated at 650kg at 51 PSI max (Which coinsides with John's comments). The Y stands for coping with a max speed of 300kph so that side of things is OK however the max load may be on the borderline perhaps...
I have these set at around 38psi. Perhaps this isn't enough. It could be that I'm losing some air which is enough over a 6 month period to put it into too low of a psi for the weight which then leads to tyre wall splitting under stress and eventually failure. This could hold some merit if there was any information that states that these tyres will fail first on the inside under low inflation conditions (As both sets of rears showed this).
Remember however that I can't be certain that the wall is giving way. From talking to the tyre guys they say that the inside split is caused from running on it flat which would lead me back to under inflation for the load over time weakening the tyre wall to eventual failure perhaps.
The biggest problems with 19's and I'm sure it would be worse with 20's and higher is that it is very hard to see any obviously loss of pressure when doing a visual tyre check without of course using an air pump. It's hard enough even to see that the tyre is flat!
Pete, I take your point re the weight issue and the fronts (which are Nangkangs and haven't failed at all since purchase). However I must say that under full accerleration the weight transfer to the back would be quite significant and perhaps enough (in combination with low pressure) to weaken the side walls over time with the inside letting go first.
The front and rears are not the same width. The rears are 9's and the fronts are 8's.
Manny the tyres are not stretched over the wheels they fit straight up with no excess but no shortage of coverage either. Basically they were chosen to be an exact fit for the rim width in accordance to the tyre supplier's recommendation.
Jason - That story concerns me as that's what I have on the front! However they have held up until now longer than two sets of rears!
Benny - Can you elaborate on "Kylie's problem" you mention? Also yes the car is lowered (not excessively) but I've got HKS hipermax II which was set up by one of Perth's best suspension shop with the correct camber (and remember was reset up after the first experience). I won't rule the suspension out as the problem though, it still could be - but I see it as unlikely.
Going through it all I am leaning towards a combination of losing air pressure over time with a combination of excessive weight transfer to the rears under load and possibly the brand not being able to withstand this combination for any length of time and causing eventual failure.
I got them from Tympe Tyres and they have suggested I take the Tyres to their rep here in Perth who will take a look and advise what may be going on and then they said they would sort it out from there. What that means in real terms is anyone's guess but at the moment I already have an extra new Nangkang of the same type arrive which was the replacement for the first so now I either need another or send it back to get a better brand (which I think I'm leaning towards regardless).
Then I can only embark on a maintenance program of weekly tyre pressure checks to see if I'm losing excessive air for some other reason...hmmm...
In terms of inflation PSI - What is everyone else set at?
Gregg, just to let you know, I'm running 20" wheels (10" width on the rear) with HiperMax II suspension also, and have been running Falken 451 tyres @ 38psi for 12 months without issues. Just trying to help you round down what the problem could be.
Tuesday, April 18, 2006 - 11:03 pm, by: Benny Gammelmark(Oldfield)
Gregg, all I know is that Kylie has the same problem. She blew a tyre just before the cruise to Neil's place (she arrived with the spare on).
She's even contemplating putting in spacers (not recommended).
Her rear suspension sits VERY low but I just don't understand how it can rub. The offset of her wheels is +38 which should put the wheel way out of reach of anything.
This is not much help, I know, but I think it's a combination of after market springs and heavy boot load. I would suggest painting the wheels with something that will rub off so that you can see where it rubs on the car. Maybe that will give a clue to what's wrong.
I know that's not much help but it's the best I can do. ...
Wednesday, April 19, 2006 - 06:33 am, by: Matthew Sharpe(Madmatt)
Definitely sounds like some of it at least is caused by manufacturing faults to me - maybe a faulty batch at your retailer? I'd be wanting an explanation and a replacement/refund too.
David Vaughan Goo Roo ACT UZZ31 V8 manual and Lexus IS300
Wednesday, April 19, 2006 - 07:34 am, by: David Vaughan(Davidv)
Sounds to me like one of - under-inflation causing heat buildup and failure - under-inflation creating sidewall damage on bumps. You pretty clearly imply that you are not checking the tyres for up to six months . Compared with the cost of tyres, I think any amount spent on a top quality pressure guage would be money well spent.
With low profile tyres it is important to maintain their pressure because the sidewalls are not very high and are therefore prone to damage if under-inflated, quite apart from the heat issue.
On tyre quality, in general I have heard decent things about Nankangs until this thread. Personally I think I would be ahead with one set of Goodyear/Bridgestone/Michelin/Pirellis rather than three sets of Nankangs but that is another issue.
Benny Gammelmark wrote on Tuesday, April 18, 2006 - 11:03 pm:
Her rear suspension sits VERY low but I just don't understand how it can rub. The offset of her wheels is +38 which should put the wheel way out of reach of anything.
That's correct. As I said on the cruise that was my old car, I had that suspension on the car for about 2 years before selling it and I never had a problem with the tyres. I've always ran Nankang NS-2 tyres on them (265/35/18 rears) and the worst it would get is having wear on the inner shoulder of the tires (cambered in). Mind you it is on very low Espelir springs and stock shocks (not the best combo but I couldn't afford shocks at the time). But I've had an array of subwoofer boxes sitting in my boot for that time and I never had a problem with tyre blow out, seems quite odd. I've always had the tyres inflated to 38psi.
Wednesday, April 19, 2006 - 12:52 pm, by: Greg Manson(Greg93tt)
Gregg Holden wrote on Tuesday, April 18, 2006 - 09:45 pm:
Greg - what plate says 94y? - surely not the factory placard? I no longer have one so I can't check. 94 would be a slightly higher load rating requirement. The 93 is rated at 650kg at 51 PSI max (Which coinsides with John's comments). The Y stands for coping with a max speed of 300kph so that side of things is OK however the max load may be on the borderline perhaps...
Wednesday, April 26, 2006 - 05:37 pm, by: Adam Peterson(President)
Im running 265 35 18's on the rears as well and also need some new rubber. Everywhere ive seen has the Nanking NS2 for about $230 ish fitted and balanced each. But as mentioned, im not going to get them if you guys have had them blow out on you !
Wednesday, April 26, 2006 - 09:49 pm, by: Gregg Holden(Xzotic)
OK, well you guys aren't going to believe this. Through some perverse set of circumstances the blow-outs are in fact unrelated to the first set and each other!!..
Basically got a full report from the tyre guys here and they confirmed that the first tyre that blew did have a nail puncture in it!
The 2nd tyre that blew had air leaks around parts of the inner rim where (apparently) the tyre was poorly sealed by the people who fit them before (Won't mention) and of course the lack of topping up of air on a regular basis. Although I'm a bit p1ssed off that my last service which was a week prior to the second one blowing didn't pick this up...hmmmm...
It's all very difficult to prove once the tyre is blown and I'd have no luck attempting to get a replacement from the guys that fit them in the first place - too many variables, too hard, not enough time... and I need to take *some* responsibility for not checking regularly myself...
So basically the first rear set went through incorrect camber. Then 6 months later I get a freak puncture in one and then a week later the other gives out through loss of pressure and then eventual failure on the side wall...Of course during all of this the fronts managed to get through unscathed and still have good pressure! What are the odds in that???!! AM I ON A HIDDEN CAMERA SHOW FOR CHRIST'S SAKE!!!
I'm off to buy a loto ticket... and then have a few of these...
Thursday, April 27, 2006 - 11:18 am, by: Adam Peterson(President)
Gregg, well mate if it makes you feel any better, my new front LH tyre is flat. I ran over some glass and its gone right up between the grooves
There is this online tyre place that interested me last nite. He has Kumho ECSTA Supra 712 tyres Postage $15 first item $9 every other item
$199 each Race track inspired, race-winning technology all wrapped up into an ultra high performance street tyre. • Silica Compound • Rotate Wear Indicators • Rim Protector
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. Compared with the cost of tyres, I think any amount spent on a top quality pressure guage would be money well spent. 
