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Old 04-06-2016, 12:49 PM   #1
toggenburg
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Default # of years using tire set before replacement

The issue is this.

Since tires have a manufactured date molded into them, there is a controversy whether tires should be replaced by their age and not just by their mileage/condition.

Example: Purchased a used car. Tires are in great shape, almost no tread wear, but tires were made in mid 2009....making them almost 7 years old.

I know tire manufacturers would want us to replace every 2-3 years for their own income, but is there some validity to trading a 7 year old set in just because it's got some age to them?

If so, then out goes these 70, 80 and 90K mileage tires that might not ever reach those numbers within a specified time, before being replaced.

The tires have no sidewall cracking, no patches and at least 60% tread left.

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Old 04-06-2016, 01:03 PM   #2
trottida
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Default Re: # of years using tire set before replacement

From what I've researched replace as per wear indicators (tread depth) or 10 years of age.

...
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Old 04-06-2016, 02:12 PM   #3
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Default Re: # of years using tire set before replacement

Use your best judgment. I believe recommended is just that - a recommendation. Visual inspection, miles, tread, age, and what you will be using the car for are all important. I USUALLY drive too much before age becomes a factor, except for that one set of Michellin's (and why I'll never buy another set) that had sidewall cracking within four years). I would also be willing to take greater risk on a car that I rarely drive at high speeds and would not take one 'cross country' with iffy looking/aged tires. My Saturn probably now comes under that category - mostly driven under city conditions.

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Old 04-06-2016, 02:59 PM   #4
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Default Re: # of years using tire set before replacement

Filter out all the B.S. and CYA lawyering and you will approach the truth. Replace tires when the tread depth has worn sufficiently that they fail the penny test or when you decide they have lost their grip regardless of how much tread is left. Ties are good until you get sidewall checking that exposes the cords or may expose the cords. If the tire is on low speed machinery then they are replaced when they no longer hold air. The X years is based on a swag for shelf life when the tire is stored in an unenvironmentally controlled warehouse.

If you live somewhere with 350+ days of full sun and are also south of 30 degrees North latitude then tire sidewall checking will be what to watch for. Car that is garaged will have a longer useful tire life.

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Old 04-06-2016, 04:37 PM   #5
saturnsctwo
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Default Re: # of years using tire set before replacement

the last set of tires I had were good year triple treads. expensive tires with a 90.000 tread life warranty. the catch is they dry rot long before the treads wear out. I replaced them when they were severely dry rotted on the side walls. they were about 6-7 years old & only had about 45.000 miles on them. I say replace tires when they start to crack, as that's a sign of age. no sense taking a chance on a tire blowout......

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Old 04-06-2016, 04:46 PM   #6
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Default Re: # of years using tire set before replacement

My last set of Firehawks lost their grip. That was enough for me (and the fast that they were not round). I don't think those tires would ever dry-rot. The sidewalls looked new.

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Old 04-06-2016, 04:50 PM   #7
onefunkar
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Default Re: # of years using tire set before replacement

I replaced tires on one of my cars when they hit 2o years old as one started to bulge out. none had any cracking and still rode fine until the bulging.

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Old 04-06-2016, 04:56 PM   #8
OldNuc
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Default Re: # of years using tire set before replacement

That can happen at 2 months as well. Those separations are not really an aging related failure. In most cases it is pothole damage that finally catches up or an old puncture that gets into the cord layer from the inside. I have run perfectly fine tires that were well past 20 years but those are quite rare.

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Old 04-06-2016, 05:03 PM   #9
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Default Re: # of years using tire set before replacement

When I bought my SL1 in September of 2015, two of the tires had a date code of 1999 and the other two were 2001. There was plenty of tread, but a lot of cracks. I immediately went to the tire shop.

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Old 04-06-2016, 05:09 PM   #10
saturnsctwo
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Default Re: # of years using tire set before replacement

Quote:
Originally Posted by bumpdraft View Post
My last set of Firehawks lost their grip. That was enough for me (and the fast that they were not round). I don't think those tires would ever dry-rot. The sidewalls looked new.
well my sidewalls on the triple treads were dry rotting & cracking everywhere. so much that I started a thread here years ago regarding this because I wanted opinions about this as I was concerned because my tires looked so bad. when they dry rotted they got noisy & I had shimmy. they also seemed to lose grip especially in wet weather....

there were cracks between the treads as well... maybe when I bought them they were older tires sitting on the shelf for years...

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Old 04-06-2016, 05:11 PM   #11
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Default Re: # of years using tire set before replacement

Quote:
Originally Posted by onefunkar View Post
I replaced tires on one of my cars when they hit 2o years old as one started to bulge out. none had any cracking and still rode fine until the bulging.
on one of my old cars i once owned I had a tire with a bubble in the sidewall as well & it bounced when I drove. a dangerous situation. it was replaced a.s.a.p....

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Old 04-06-2016, 09:33 PM   #12
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Default Re: # of years using tire set before replacement

http://www.ntsb.gov/news/events/Docu...el_4b_Kane.pdf

More to chew on.

Seems that tire manufacturers of course don't want their tires to last over say, 6 years, so maybe they skimp on certain stress-crack preventative additives or simply put, they put re-occurring income ahead of long term safety.

Perhaps, 10, 15-20 years ago, these manufacturers had a different game plan than they may show today.

Kinda like the light bulbs that my grandmother had in her Chicago bungalow; grandpa put them in before 1920, and they were still in daily service when she died in 1987. Made by the Chicago based company, calling their product "the 100 year bulb" as I recall them telling me. My dad (born in 1916) verified that these were still the same bulbs since he was a lad.

Modern tires might not be made to last like they did a few years ago?

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Old 04-06-2016, 11:28 PM   #13
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Default Re: # of years using tire set before replacement

In 2012, I owned a 1987 Buick Century that was lovingly cared for, barely driven and garage kept in a climate controlled garage in a little old ladies house and driven on the weekends.

The car had tires from 1993 on it. The car it self had 35K miles. The tires were all Goodyear something or another. No dry rot, they weren't hard, the tread was excellent. Perfect condition, 19 year old tires.

I put over 30,000 of my own miles on them before I sold the car. They were still fine.

It just depends on condition and how they were cared for.

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Old 04-07-2016, 03:15 AM   #14
mattwithcats
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Default Re: # of years using tire set before replacement

I just replaced a pair that were 04/04 and 50/03.....

A little cracking, and they were starting to get noisy. Still had tread left...

I inflate hard , 250-270 Kpa in a 300 Kpa max tire. Got 50,000 out of a set of generic blemished tires (Phaser)

New ones are Hercules Road Tour 4.0, $100 clams installed for two, 520 A A tread / temp. They are weird, not directional, but a specific side needs to face out...


10-12 years would be my max....

...
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Old 04-07-2016, 10:21 AM   #15
saturnsctwo
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Default Re: # of years using tire set before replacement

Quote:
Originally Posted by toggenburg View Post
http://www.ntsb.gov/news/events/Docu...el_4b_Kane.pdf

More to chew on.

Seems that tire manufacturers of course don't want their tires to last over say, 6 years, so maybe they skimp on certain stress-crack preventative additives or simply put, they put re-occurring income ahead of long term safety.

Perhaps, 10, 15-20 years ago, these manufacturers had a different game plan than they may show today.

Kinda like the light bulbs that my grandmother had in her Chicago bungalow; grandpa put them in before 1920, and they were still in daily service when she died in 1987. Made by the Chicago based company, calling their product "the 100 year bulb" as I recall them telling me. My dad (born in 1916) verified that these were still the same bulbs since he was a lad.

Modern tires might not be made to last like they did a few years ago?
some old tires might look good but the rubber can be hard & give out causing an accident like in the link. to those who brag about having 10-20 year old tires on your car that's great, but your taking a chance. I wouldn't trust old tires any more than I trusted mine. I got rid of the tires when they were dry rotted. my life is more valuable than a set of tires...

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Old 04-07-2016, 03:56 PM   #16
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Default Re: # of years using tire set before replacement

+1 on that. The standard is by the government that says 10 years is tops. A tire shop is not even allowed to service or remount a tire that is over that spec. Just happened to me. Original spare on my Infiniti would not hold air due to rim leak. Tire shop would not touch it. And this is a tire shop I trade at regularly. With as many cars as I own I buy A LOT of tires. They know be on a first name basis as soon as they see my cars LOL. And they would not handle it for all the tea in China because of that law and their potential liability. You may be fine taking chances with your own life on old dry tires but you're also gambling with my life and my family's lives when you're out there.

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Old 04-07-2016, 04:10 PM   #17
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Default Re: # of years using tire set before replacement

The Gov & the tire industry came up with that law and it is based on tire rubber compounds no longer available and which were not available before the law was passed.

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Old 04-07-2016, 04:11 PM   #18
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Default Re: # of years using tire set before replacement

since my spare tire is original I should just get it replaced no matter what it looks like.... the fact that these just blow up without being used is further testament to this...

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Old 04-07-2016, 04:16 PM   #19
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Default Re: # of years using tire set before replacement

The way I see it, rubber gets hard and loses its original grip. If you're taking a sharp turn at 90 on a crotch rocket young tires are important. But otherwise most everything on your car is less than original performance so that's not really a realistic standard. If they handle ok for your driving type I'd leave them alone. Same goes for shocks/struts. They're not new the moment you leave the dealership so decide how much you want to care.

If it makes a difference check the dates when you buy tires. I bought a set for my bike and found the rear was almost 2 years old when I had it mounted. But the old ones were 10 years old and noticeably harder.

As a point of reference, the legal standard for aircraft tires is no cord showing.

-Robert

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Old 04-07-2016, 04:27 PM   #20
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Default Re: # of years using tire set before replacement

The aircraft standard makes sense, the auto-truck tire law is a govt payoff to Big Tire for a campaign contribution.

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