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Tires, tires, tires

7006 messages,  Last post on Oct 29, 2009 at 11:24 AM

You are in the Maintenance & Repair Forum. Your Host is mr_shiftright

What is this discussion about? Tires, Wheels, Steering

Edmund's Feature Article: Tire Safety: Don't Ignore the Rubber on the Road

For dedicated winter tires, also have a look at the Snow/ice winter tires discussion topic.


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#6963 of 7006
Re: How many people really discard all their tires after 10 years? [woodyww] by jeffyscott
Aug 23, 2009 (12:28 pm)
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Replying to: woodyww (Aug 23, 2009 12:14 pm)

So your state requires some sort of inspection by people with an interest in seeing you fail, so that they can overcharge you for whatever you need to have fixed in order to pass?
#6964 of 7006
Re: How many people really discard all their tires after 10 years? [woodyww] by explorerx4
Aug 23, 2009 (4:51 pm)
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Replying to: woodyww (Aug 23, 2009 12:14 pm)

ct works the same way, the testing stations are also repair centers.
i just had the emissions test done on my 1991 mustang.
it is too old to be OBD II, so they have to test it on a dyno.
while it was being tested, i could remember hearing it, which seemed unusual.
when i checked the report it indicated the test was done over 2300 rpm.
1000 rpm = 40 mph, so do the math.
that test was one of my motivations to finally get some new tires.
of course, i bought them from someone else.
#6965 of 7006
Summer Tires by oldfarmer50
Aug 24, 2009 (9:22 am)
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Why is it that most summer performance tires state that they are not for driving at temps below freezing? I understand why you wouldn't want to use them in the snow but why are temps so important?
 
I would never drive a summer tire in snow or ice because I know they are not designed for it but I could see taking them out occasionally in cold weather on dry pavement.
#6966 of 7006
Re: Summer Tires [oldfarmer50] by ruking1
Aug 24, 2009 (9:31 am)
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Replying to: oldfarmer50 (Aug 24, 2009 9:22 am)

Obviously tire information places like www.tirerack.com are good sources.
 
For discussion purposes, let me take a stab. So called "summer tires" are optimized for performance within temperature parameters (when warmed) . No harm/ foul taking summer performance tires in cold but dry pavement. But unless compromised for that, the tires do not perform as best they could when say temps are 75 F up to 110 F.
#6967 of 7006
Re: Summer Tires [oldfarmer50] by colin_l
Aug 24, 2009 (11:03 am)
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Replying to: oldfarmer50 (Aug 24, 2009 9:22 am)

The rubber compound actually does not perform at low temperatures, to the point that it will be noticeably hard and slick instead of grippy.
 
A high performance vehicle (which is what most summer tires are mounted on) will not brake, corner or even accelerate as well if you do use a summer tire in cold, dry temperatures.
#6968 of 7006
Re: Summer Tires [colin_l] by oldfarmer50
Aug 26, 2009 (9:13 am)
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Replying to: colin_l (Aug 24, 2009 11:03 am)

"...will not brake,corner or even accelerate as well..."
 
That's what I thought. So it's a matter of reduced performance rather than having something happen to the integrity of the tire itself. In other words the tire won't blow up if you drove it in winter.
#6969 of 7006
Re: Summer Tires [oldfarmer50] by mz6greyghost
Aug 26, 2009 (11:09 am)
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Replying to: oldfarmer50 (Aug 26, 2009 9:13 am)

In other words the tire won't blow up if you drove it in winter.
 
Correct, but you and/or your car would if you tried to drive on them in 3" of snow.
#6970 of 7006
Re: Summer Tires [oldfarmer50] by capriracer
Aug 27, 2009 (2:39 am)
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Replying to: oldfarmer50 (Aug 26, 2009 9:13 am)

".........That's what I thought. So it's a matter of reduced performance rather than having something happen to the integrity of the tire itself......."
 
There is one possibility that I should point out.
 
Rubber compounds have "glass transition temperatures", where the properties change at given temperatures. These will vary from compound to compound - and ceratin between manufacturers.
 
But there is a temperature below which rubber compounds tend to become brittle and crack. This, of course, also varies from compound to compound. In most cases, this temperature is bitterly cold - say below -20°F
 
Nevertheless, it is good advice that summer tires should not be used below 40°F.
#6971 of 7006
advice needed by stickguy
Sep 13, 2009 (7:44 pm)
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I have a 2000 Acura TL. My sons car, that is now my "spare" car since he is away at college (freshman). There is, however, a chance that I sell my other car and just keep the TL until next summer when he needs it again.
 
Anyway, the tire issue. Discovered recently that 1 tire (RF) has a small sidewall bulge (an impact break from the couple of tire guys that looked at it). Probably has been there for a while, since the kid remembers hitting a big pothole back in late winter/early spring, and there is some cracking around the bump.
 
question is two fold: How dangerous is it to drive with, and what should I do to replace?
 
tires on car are 4 years old, 58K on them, but still with ~4/32 tread (very evenly worn too). OEM replacement Micheling (MXV4, maybe energy? Something I don't think they make anymore).
 
Too much wear to replace 1 (and the comparable tire tends to be a ridiculous price).
 
I have never been a fan of replacing just 2 tires, but right now, I am not a fan of spending much money on this car.
 
So, how much will I notice (actual drving, not the mental aspect of knowing about it and having it bug me) if I put 2 other tires on one end? Have been considering Eagle GT (for price), Yoko Avids, and Potenza G019 girds.
 
For now, I am only using the car around town a couple days per week to give it some exercise, so maybe 30-40 miles local?
 
Am I taking my life in my hands ignoring the issue for a while? And, would I be nuts to put on just 2 tires, even though the rears have a decent amount of life on them?
#6972 of 7006
also by stickguy
Sep 13, 2009 (7:44 pm)
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car drives fine. Perfect alignment, no vibration at all even at highway speed (damn thing has better tire balance then my other 2 cars!)

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