When To Replace Car Tires?

[brahmacharya]

Sharing this as I thought it will be useful for others

Ninna Car servicing ki pote mechanic gadu tires urgent ga marchamannadu...."All your tires have reached legally worn out tread depth (2/32)" Since I never changed my tires I did some search to double check what he said and here is what I found:

[url="http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=197"]http://www.tirerack.....jsp?techid=197[/url]

[brahmacharya]

[b]Tread Depth[/b]
Tread depth is a vertical measurement between the top of the tread rubber to the bottom of the tire's deepest grooves. In the United States, tread depth is measured in 32nds of an inch. Because it is difficult to accurately measure tread depth with a ruler, tread depth is best measured with a tire tread depth gauge. When tires have neared the end of their life, a U.S. Lincoln penny can also be used to confirm the tire's tread depth. If Lincoln's entire head is visible, the tire is worn to approximately 2/32" and is considered legally worn out in most States.
Average new tires used on cars typically start with 10/32" to 11/32" of original tread depth. Dedicated winter / snow tires and light truck tires typically are deeper (for light truck tires, how much deeper depends on the tire's tread type ... Highway Rib, Highway All Season, Off Road All Terrain or Off Road Maximum Traction).
As mentioned above, tires are legally "worn out" In most States when they reach 2/32" of remaining tread depth. For example, a typical tire that starts with 10/32" of original tread depth has only 8/32" of useable tread depth. Its useable tread depth is calculated by subtracting a worn out tire's 2/32" from the new tire's original depth of 10/32". The final 2/32" of a tire's tread depth isn't part of the equation when it comes to calculating tread depth percentages because the tire is already legally worn out with just 2/32" of remaining tread depth.
Useable tread depth is calculated by subtracting 2/32" from the tires new tread depth. Then usable tread depth is compared to remaining tread depth in order to calculate tread wear percentages. For example, a tire that started with 10/32" of original tread depth and has worn off 4/32" (down to 6/32" of remaining tread depth) is 50% worn.
[center]
10/32" original tread depth
[b]-2/32" legally worn out tread depth[/b]
8/32" of useable tread depth.
8/32" useable tread depth
[b]-4/32" measured tread depth worn away[/b]
4/32" of remaining tread depth (50% of 8/32")[/center]
A tire that starts with 10/32" of original tread depth has 12.5% wear for every 1/32" that is worn away, and a tire that starts with 12/32" " of original tread depth, has 10% wear for every 1/32" that is worn away, etc.

[iTeachSAP]

matter single line please

[brahmacharya]

[url="http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=197"]http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=197[/url]

U.S. coins can be substituted for a tire tread depth gauge as tires wear to the critical final few 32nds of an inch of their remaining tread depth.
Place a penny into several tread grooves across the tire. If part of Lincoln's head is always covered by the tread, you have more than 2/32" of tread depth remaining. [img]http://www.tirerack.com/images/tires/tiretech/pennyfront.jpg[/img]
2/32" remaining tread depth
Place a quarter into several tread grooves across the tire. If part of Washington's head is always covered by the tread, you have more than 4/32" of tread depth remaining. [img]http://www.tirerack.com/images/tires/tiretech/quarter.jpg[/img]
4/32" remaining tread depth
Place a penny into several tread grooves across the tire. If the top of the Lincoln Memorial is always covered by the tread, you have more than 6/32" of tread depth remaining. [img]http://www.tirerack.com/images/tires/tiretech/pennyback.jpg[/img]
6/32" remaining tread depth

[brahmacharya]

Once you have determined the approximate remaining tread depth in the first location, you can complete your measurement of each tire by placing the coin into additional locations at least 15 inches apart around the tire's central circumferential groove, as well as in its inner and outer grooves. This will help detect uneven wear caused by mechanical or service conditions.
[b] The Law[/b]

According to most states' laws, tires are legally worn out when they have worn down to 2/32" of remaining tread depth. To help warn drivers that their tires have reached that point, tires sold in North America are required to have indicators molded into their tread design called "wear bars" which run across their tread pattern from their outside shoulder to inside shoulder. Wear bars are designed to visually connect the elements of the tire's tread pattern and warn drivers when their tires no longer meet minimum tread depth requirements.
[b] Common Sense[/b]

However, as a tire wears it's important to realize that the tire's ability to perform in rain and snow will be reduced. With 2/32" of remaining tread depth, resistance to hydroplaning in the rain at highway speeds has been significantly reduced, and traction in snow has been virtually eliminated.
If rain and wet roads are a concern, you should consider replacing your tires when they reach approximately 4/32" of remaining tread depth. Since water can't be compressed, you need enough tread depth to allow rain to escape through the tire's grooves. If the water can't escape fast enough, your vehicle's tires will be forced to hydroplane (float) on top of the water, losing traction.

If snow-covered roads are a concern, you should consider replacing your tires when they reach approximately 6/32" of remaining tread depth to maintain good mobility. You need more tread depth in snow because your tires need to compress the snow in their grooves and release it as they roll. If there isn't sufficient tread depth, the "bites" of snow your tires can take on each revolution will be reduced to "nibbles," and your vehicle's traction and mobility will be sacrificed. Because tread depth is such an important element for snow traction, winter tires usually start with noticeably deeper tread depths than typical All-Season or summer tires. Some winter tires even have a second series of "wear bars" molded in their tread pattern indicating approximately 6/32" remaining tread depth to warn you when your tires no longer meet the desired tread depth.

[brahmacharya]

[quote name='iTeachSAP' timestamp='1368718491' post='1303759421']
matter single line please
[/quote]

2/32 nds or 1/16th of an inch ki digithe the tire has reached the legal wear out limit so replace them....do the penny test to check.

[KOTC]

GP

[victor_raja]

Good post....

[Piscop]

[victor_raja]

[brahmacharya]

LTT....tires marchali vayya July 4th varaku agatam manchidantara please suggest?

[BMW]

[brahmacharya]

cheppandi vay...July 4th time lo deals padataya?

[vijayjust4u]

3 konte okati free ani BJ's, PepBoys lo chaalaa chotla undhi...

[iTeachSAP]

tirelu arigi poyina alage tirigithe cops patukoni fine vesthada?