The three or four longitudinal channels on the tire surface are called guiding flume, and the main function is to drain water. Because the tire is driving at high speed on the rainy road, a thin film of water will be formed between the tire and the road, in order to increase the contact between the tire and the ground, a number of guide tanks will be set up on the longitudinal side of the tire to effectively drain the tire. 

The channel is mainly used to drain water, if there is no channel then there will be a layer of water film between the tire surface and the road surface, affecting the friction. The horizontal pattern on the side of the channel is generally auxiliary to cut off the water film.

So how come some tires have three grooves and some have four? This is mainly designed according to the width of the tire and the width of the groove, some tires are very narrow, the use of three can meet the requirements, some tires are very wide, you need 5 grooves, some groove width is large, the drainage of three is equivalent to the normal four, so you do not have to struggle with this problem, this is the engineer in the design of tire pattern to consider the problem, You just have to choose your tires according to your tire model.

Now the tire is basically asymmetrical pattern, that is, the tire on both sides of the pattern is not symmetrical shape, some manufacturers may be designed for performance, generally speaking, the outside pattern affects the turning performance and handling, because the outside ground area is larger when steering, and the inside pattern affects the driving performance, because the tire front beam makes the driving wheel move inward. The inner ground area is larger. This type of tire generally marks the direction on the side, and the side marked OUTSIDE needs to be placed outside, which can give full play to the performance of the tire, and if it is reversed, it may affect the performance and aggravate the wear.

In SUMMARY: Although there are many brands of car tires, the pattern on the tire is not the same, but not all tires are suitable for their own cars, some owners pay more attention to the control of the car, some owners pay more attention to the fuel consumption of the car, however, if it is a front-drive model we can make the front wheel into 3 trenches of the tire to increase grip, and the rear wheel is changed to 4 trenches, It gives you better grip and good drainage.