【龍Sir教室 Ep17】使用輪胎六大貼士（內附字幕）｜TopGear HK 極速誌

Last time I talked about some basic knowledge of tires Tires are consumables Change sooner or later But remember that tires are related to driving safety We should have good car usage habits And good habit of using tires Can extend tire life on the one hand It can also guarantee driving safety What is a good habit For example, every time before driving Take a look at the tires Do not drive if there is a leak Many people know this You can try the following method If there are passengers travelling Let the passengers get in the car and sit down Because if the tires are slightly flat May not be easy to see But if the vehicle is loaded You can see clearly This is a very good method Also when I go to refuel every week Check the tire pressure at the gas station A better way is Buy a tire pressure gauge No need to go to the gas station You can check the tire pressure at any time There should be a standard tire pressure label inside the car At the B-pillar next to the driver’s door May also be at the back of fuel tank cap Sometimes the unit of tire pressure is metric kPa Or Bar Sometimes imperial psi May be dizzy I give you a magic number Everyone remember 7 words People who have driven for decades We always remember psi like 30 pounds In recent cars, metric kPa is used 210kPa is equal to 30 psi The difference is about 7 times About this number The exact number should be 6.9 If you see Bar (1Bar=100kPa) Can be divided by 0.07 If it is Kpa, divided by 7 The result is psi This is the "pound" that people often think of And regularly inflate the spare tire The spare tire must be checked every three months Otherwise when needed I found out that it was flat Then trouble Inflate the spare tire The pressure can be higher As long as the tire pressure does not exceed the upper limit Because the spare tire will slowly leak The front and rear wheels work differently Especially the front-wheels driven vehicle The front wheel has to steer Have to bear higher weight More to drive the car body wear and tear will be very fast Even a rear-wheel driven vehicle The front wheel works differently from the rear wheel Even though the front tires seem to wear very evenly But the outside and inside corners of the tire Wear will be more So the tires must be interchanged regularly What is regular For example, whenever there is a need for inspection or maintenance You can interchange the tires along the way How to interchange Note that some tires have restrictions For example, the rear wheels are wider than the front wheels It is impossible to reverse Can only swap left and right If the tire is unidirectional It can’t be reversed (the tire is not off the rim) If the tire does not have the above restrictions My suggested is The left front wheel is adjusted to the right rear wheel When the rear wheel is adjusted to the front wheel But don't need to move left and right If so The tire can experience the front, rear, left, and right positions More difficult to cause eccentric wear Tire wear is also more average To remind everyone The difference between the front and rear tires wear cannot be too large Especially for four-wheel driven cars Differential in the middle If the difference between front and rear tire wear is large The differential is under too much work Will accelerate the damage of the differential According to the law The tire tread depth must be at least 1mm But 1mm is too little Too dangerous We shouldn’t change tires until 1mm Today's tires There are warning marks on the tread If the damage has reached the warning marks It’s time to change the tires But sometimes we may find that The tires are not particularly worn In fact, the inside has been severely worn If there is eccentric wear It’s also time to change the tires Are there other situations? Severely damaged tires Pierced a big hole Cannot be repaired Or pierced both sides of the crown The position of the sidewall is pierced Introduced in the last episode The sidewalls on both sides of the crown are relatively thin Difficult to repair If really pierced To change the tires If you find the vehicle is running sideway for no reason while driving Or unusual vibration Whether on rough or smooth roads You still feel these vibrations The first thing to check is the tires It’s not necessarily the tire May be a more complicated issue But you should still check the tires first Is there eccentric wear or radial runout If you have to deal with the tires first Tire eccentric wear Is a common problem If the center of the crown is worn Tyre pressure is too high If the tire crown is worn on both sides No problem in the middle The reason is just the opposite Tire pressure is too low Eccentric wear on the front wheel Whether there is a problem with the steering tie rod If there is a problem with the steering tie rod Eccentric wear must be a pair That is, the inner side of the two front wheels is eccentrically worn Or the outer side of the two front wheels is eccentrically worn If the front wheel has only one tire eccentrically worn Whether it is outside or inside It’s not caused by steering tie rod Other reasons For example, the suspension camber angle is incorrect Or ball joints on the rocker arm Wear These require professional follow-up Eccentric wear is more often caused by suspension problems The solution is to have four-wheel alignment When to do four-wheel alignment If the suspension system has been repaired Or replaced parts After that, four-wheel alignment will be done immediately If the tire is worn Four-wheel alignment should also be done when changing tires Otherwise replace the tire It's just a waste of money The first is a unidirectional tire Even when you use it, you don’t need to consider its direction of rotation No need to consider the inside and outside You start from the center line of the tire surface The patterns on both sides are symmetrical Although it seems a little asymmetric But precisely because it looks asymmetric When adjusted from left to right You will find that the patterns are the same The advantage of this type of tire is economical and practical Easy to interchange The other is directional tires It is not difficult to identify directional tires From the center line of the tread The patterns on both sides are exactly the same There are usually very diagonal patterns This type of tire can only rotate in a single direction If you turn the tires around You can see the pattern is reversed Can not be installed and used like this The advantages of unidirectional tread pattern are Very good wet performance In the rain and snow This type of tire will perform better This is an asymmetric tire Not difficult to distinguish From the center line of the tire crown The patterns on both sides are obviously different When installing this type of tire Must be very clear about outside and inside of the tires It is marked on the sidewall The outer structure of this type of tire is relatively strong Softer inside Balance performance and comfort In recent ten years and eight years Asymmetric tread tires become popular Especially high-performance cars Basically use this tire This tire is also asymmetric in appearance It has a special design It is a run-flat tire Can still walk after air leak Because of the reinforced structure on the sidewall After a flat tire The deformed place is the sidewall How strong are we trying Pretty good Run-flat tire is referred to as RFT Run-flat tyre It can also be seen in tire size Like here 245/40RF18 F stands for run-flat tires Use run-flat tires Be careful not to visually detect air leakage Must install tire pressure sensing system To monitor If there is a flat tire Should not continue driving under pressure for a long time Should be dealt with as soon as possible There is no free lunch in the world Tires work by friction If you want good steering performance Good wet performance Use wider tires Increase friction Naturally will use more horsepower Also increase fuel consumption This is a personal choice Remember to follow personal needs If you drive a car with more than 100 horses But use very wide tires Even if it can be installed In use You may find that the vehicle consumes more fuel Slower too Is normal Is a personal choice Whether you are driving Or someone who likes to drive Tires always have endless topics Two episodes in a row I hope I can give you some tips If you have further questions Welcome to leave me a message I try to answer

Channel: TopGear HK 極速誌

Views: 275,335

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Id: wkAPh92cLOA

Length: 12min 43sec (763 seconds)

Published: Tue Sep 15 2020