1. Tires should be changed according to the manufacturer's instructions, which recommend replacing tires no more than 6 years after the date of manufacture. 2. Tires older than 5 years or with more than 4,000 miles should be considered for replacement due to rubber degradation, even if they appear undamaged. 3. Tires should be replaced when the tread depth is less than 1.6-2 mm, as indicated by wear bars molded into the tread, for sufficient grip and braking ability.

1. When your tires should
be changed?
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2. According to the National Transportation Safety
Board with 20 tires are explored, there will
have 10 casualties or death! But just keep in
mind a few guidelines below will help you
eliminate this concern.
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3. 1.The manufacturer's instructions: never to exceed 6
years from date of manufacture
On the tire always has a sequence number. For the last 4 digits
show the date that produced tires. For example, if the last 4
digits are 1404 series, which means this tire was made on the
14th week of 2004. The duration of use recommended by the
manufacturer shall not exceed 6 years from date of
manufacture. A tire too "land" is usually blurred this sequence,
whether on the surface there seems no problem at all. When
they are out of date it means all the inherent features have been
lost. Manufacturers have anticipated this and suggested that
even the totally new tires haven’t been used and are stored in
stock but they should be considered to be out of date and end
the life.
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4. 2. Practical experience (1)
- Time and distance: The tires which have more than 4
years from date of production shouldn't be bought..
After 5 years the tire is quite fitted to the new change
regardless of the vehicle is running or not, more or
less. Life expectancy of the rubber is no longer sure if
it exceeds this period. Additionally, there are some
practical experience shows that the car runs about 4
thousand miles should consider changing tires. Of
course, they depends much on other conditions such
as the types of road...
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5. 2. Practical experience (2)
- Visual inspection: Usually using visual inspection to
detect the potential problems on your tires. Then you
can check the pressure, check to see if there are the
very sharp object stabbed the tires and make
puncture. Even if the slashes do not leak a bit but still
can not contain dangerous vehicles operating at high
speeds.Or a crack caused by smaller punctures can
eventually cause larger holes and would lead to
problems when the car is on the road.
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6. 3. Should check the wear of spikes
on the tire (1)
Usually the depth of flowers tire groove is the lowest
allowed for 1.6 to 2 mm; when exceeding this limit,
the tire will no longer sure grip, even very drainage.
Many tires have wear bars indicated spikes are
molded in the tire tracks along the flowers, when
spikes are worn with rubber lugs is appointed to
replace the total new tires.Any expression that also
has its potential problems, or if you feel completely
ready for new tires, immediatly take your car to the
store nearest to your location.
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7. 3. Should check the wear of spikes
on the tire (2)
 Often the distance from the surface to spines
about 1.6 mm-2mm should be replaced.
mm-
 Also, you should be careful to carry the car tire
test of the following occurs:
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8. 3. Should check the wear of spikes
on the tire (3)
Cracks: the garage in the high temperature
environment such as sun, long days in the
parking garage, or tires are changed but stored
in stock for a too long time may lead to this
situation.
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9. 3. Should check the wear of spikes
on the tire (4)
Tire down slowly: with the naked eye you would
not know the reason why to this situation.
However, because of the safety of yourself you
should take your car to the tire shop
immediately after this treatment. Deliberately
drive a car with light steam ride tires can lead
to coronary condition wheels punctured tire
when the car put down pothole at very fast.
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10. 3. Should check the wear of spikes
on the tire (5)
Tear: you can not see signs down slightly but
this is a big potential of the tires burst
whenever you want because the vapor pressure
in the tires are great. In terms of high-speed
high-
vehicles are likely to lead to tire explosion
hazard when losing the driver.
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11. http://www.thechromepros.com