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Tires are an important part for our life


Last time, I talked a lot about "engine break-in" to make your car your
This time, I would like to talk about "tire break-in".
table of contents.

1. Review from tire knowledge

First, let me talk about tire knowledge.
As a general premise, it is impossible to use used tires. The date of
manufacture and factory can be identified by the symbol printed on
the tire, but the tire begins to deteriorate from the day it is
manufactured. Rubber, which is the main raw material, is vulnerable
to ultraviolet rays, and just as old rubber bands click and cut, tires
also become stiff, reducing grip and cracking. As an example, French
tire manufacturer Michelin collects high-grip tires for unused
motorcycles from the warehouse for a certain period of time from the
date of manufacture. "Because the performance drops and it is
In addition, tires that are assembled on wheels are burned by the heat
of running, and the ears of the tires that come into contact with the
wheels stick to the wheels and become hard, preventing air leakage.
So you can't trust a used tire that you removed from the wheel.
Even if it is an unused tire, tires that have deteriorated due to rain or
sunlight at the store have reduced ride comfort and grip.
When buying a new tire, it is best to buy a new tire that has been in
the early days and has been managed in a warehouse. In addition,
the best tire brand is the one specified as genuine or the one of the
upper model of the same series, but there are requests such as "I am
worried about tire noise", "I want to emphasize wet performance", "I
want to emphasize dry performance" etc. For example, consult a tire
advisor to decide.
By the way, I am also a tire advisor.
For normal use, the normal tire is the best, but if you have dressed up
or customized and changed the suspension, please decide according
to your preference. If you change the size of your tires or wheels, you
will need to consult your store's tire advisor to change the alignment
and air pressure. It is difficult to balance the appearance and drive
comfortable, so please consult with your wallet and a specialist to
determine the ideal you are looking for.
The price of the tires you worry about varies depending on the size of
the vehicle and the size of the tires, but in the case of the Prius (195 /
65R) it is about 6,000 yen per tire, and if it is high, it will exceed
20,000 yen per tire.
Tire life is 30,000 to 50,000 km or 3 to 5 years for summer tires. If the
tire groove is 1.6 mm or less, it violates the Road Traffic Act, and the
passing line of the vehicle inspection is also 1.6 mm.

2. About break-in of tires

So much for the long introduction, let's talk about the main theme,
"tire break-in."
After replacing the tire with a new one, the tire is conditioned, but
when the new tire is assembled on the wheel and inflated to increase
the pressure inside the tire, the tire swells. In addition, the weight of
the car causes it to bend.
By running for a certain period of time in this state, the tires and
wheels will stick together due to the heat of running, air leakage will
disappear, and the entire tire will be burnt.
Depending on the driving conditions at this time, the quality of break-
in will change. It is a good condition when driving on a highway that
can run at the same speed with less unevenness on the road and no
start and stop. This is because once you start driving, you will not
stop, you will be able to keep a constant number of revolutions, and
the heat will be evenly applied.
After driving about 50km, I think the tires and wheels are getting hot
After driving, if the tires and wheels cool to almost room temperature,
the break-in is finished and the tires will harden in a shape that
matches the wheel size.
Tire break-in is to be in close contact with the wheel and to have a
shape that matches the weight and size of the vehicle.
So I can't trust used tires.

many tires

After that, if you rotate the tires at regular intervals, it will be longer
life. If the tires are worn out or unevenly worn, they are out of
alignment and should be adjusted. Also, it is not recommended to
remove it from the foil and rearrange the front and back of the tire.
By the way, the air pressure of my car is 10% higher than the
specified air pressure because it is mainly used on general roads, but
it is 20% higher on expressways in the summer.
It is best to replace a flat tire with a new one, but due to wallet
circumstances, we may repair and use it. Since the fiber belt of the
structure inside the tire is broken, please use it as a rear tire or drive
comfortably and quietly.
If it is a motorcycle, it will be replaced immediately.

3. Will new tires slip? Noisy?

It is often said that "new tires slip" and "noisy", but they slip because
they are before the tires are conditioned and peeled off. Since it is
molded with a metal mold in the manufacturing process, the surface
is slippery. Furthermore, the sound changes when the tread pattern
(jagged tires) changes.

4. Summary

It is said that "tires carry our life", and I think that's right.
Warming up and maintenance are very important because it is a car
that saves lives.
Next time, I will talk about "puncture prevention driving method"!

>>Word explanation
Parts between the tires and the car body that cushion the impact from
the road surface and improve the driving comfortable.
Also known as "wheel alignment". Subtle tire-to-car angle distortion
caused by driving. By adjusting the deviation, the tires will wear out
evenly and will be longer life.
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