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-   -   Good tire size with lowering springs (https://mustangforums.com/forum/2005-2014-mustangs/718811-good-tire-size-with-lowering-springs.html)

rlh6805 04-23-2015 02:55 PM

Good tire size with lowering springs
 
I have a 2008 GT that has the original tires on it still. The car only has 25k miles. I am thinking it's time for new tires as these are pretty old and I want an upgrade. I am planning on installing the Ford Racing lowering springs:


What is a good tire size to go with? I have the factory 18" wheels.

The ones on it now are 235/ZR50/18

cruisin5268d 04-23-2015 10:16 PM

If your tires are original then they are not safe for driving at this age. I would get rid of them as soon as you can, regardless of remaining tread.

6 years is the max - and yours are past that point.

roegs 04-24-2015 12:04 AM


Originally Posted by cruisin5268d (Post 8480145)
6 years is the max - and yours are past that point.

6 years is the conservative end of the range. Depending on who you ask the recommended replacement age is from 6 to 10 years.

cruisin5268d 04-24-2015 12:56 AM


Originally Posted by roegs (Post 8480162)
6 years is the conservative end of the range. Depending on who you ask the recommended replacement age is from 6 to 10 years.

I'm sorry, but your information is inaccurate. The rate of failure increases drastically around 6 years. You simply cannot beat the clock and factors such as oxidation and degradation of rubber compounds. Some environmental factors speed this process up further.

http://abcnews.go.com/Blotter/story?id=4822250&page=1

http://www.safetyresearch.net/tire-safety

The rest of the world (outside of America) say tires older than 6 years should only be used in emergency situations. Even U.S. automakers have been recommending federal safety changes.

Tires are one of the most important safety features of your vehicle. This is not where you want to cut corners.

Norm Peterson 04-24-2015 06:43 AM

<shrug>


from that safetyresearch.net link . . . and FWIW the British Rubber Manufacturers Association (BRMA) represents the same tire manufacturers in the U.S. market


“BRMA members strongly recommend that unused tyres should not be put into service if they are over 6 years old and that all tyres should be replaced 10 years from the date of their manufacture.”
and it also mentions a pretty strong link between tire involvement in accidents and hot climates (underlining theirs, boldface mine).

The most significant data that links tire age to failures was cited in the August 2007, NHTSA’s Research Report to Congress on Tire Aging. In 2005, a provision in the Safe Accountable, Flexible and Efficient Transportation Equity Act required the agency to report to Congress by August 2007 on tire aging, including potential regulatory testing to evaluate the risk of failure after a tire has been aged. The agency reviewed insurance company tire claims reported from 2002 through 2006 and found 77 percent of the tire claims came from five hot-climate states (including California) and 84 percent of these claims were for tires more than six years old. This is the strongest published evidence to date of the link between tire age and tire failures.
That said, I wouldn't put tires with a 2008 or possibly 2007 date code in unrestricted service either. I've taken one set of tires out of service already this year, and replacements for the Mustang's "3-season" tires (being a replacement set themselves) went on order earlier this week.


This matter of tire aging can in some situations work against the appeal of big UTQG treadwear numbers and warranted tread life. Something to keep in mind if you have any cars that are driven only a few thousand miles a year, where you would be encouraged to replace them even though half their usable tread might still remain . . . at 5000 miles/year it would be foolish to consider 60,000 mile tires for any reason involving tread life.


Norm

rlh6805 04-24-2015 10:29 AM

OMG!!! No kidding guys. The reason I am asking about a good tire size to go with the lowering springs is because I'M GOING TO GET NEW TIRES!!!!

I don't mind going with staggered as the car doesn't get driven that much.

Tire Rack says for the same size all around to go with 255/45-18

For staggered: Ft: 255/45-18; Rr: 285/40-18

BWfVA 04-25-2015 04:33 PM

I have to say you all took it way off topic.

He is just looking for recomendations on tires. I personally cant recomend any but go to a reputable company like AM or Tirerack and they have guarentteed fitments

cruisin5268d 04-25-2015 04:38 PM


Originally Posted by BWfVA (Post 8480482)
I have to say you all took it way off topic.

He is just looking for recomendations on tires. I personally cant recomend any but go to a reputable company like AM or Tirerack and they have guarentteed fitments

Yes, my post did get a little off topic but this situation can be classified as a "teachable moment." The OP is driving a ticking timebomb and it is important for people to realize the dangers involved with the use old tires.

bl817 04-25-2015 04:41 PM

For those of you that don't know how to tell how old your tires are, there is a 4 digit number on the side wall. ex. (3412) that would mean the tire was made in the 34th week of 2012.


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