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If you want to modify (upgrade) the tire, you need to know the model of the tire rim first. Most car tires will be marked. For example, the tire of Fukang is 165/70R 14. The first number 165 indicates that the tire width is 165 mm, and the second number 70 indicates that the ratio of the tire section height to the tire width is 70%, that is, when the tire width is 165 mm, the tire section height is 165 times; 70%= 1 15.5mm, the last digit R 14 represents 14 inch rim diameter, and the rim type of Fukang automobile is 146.5J, 14 represents 14.
Therefore, once the model is known, the tire rim can be upgraded by calculating the size.
The English letter HK stands for allowable speed code, where H stands for speed limit, R stands for tire type, and finally 14 stands for 14 inch rim diameter. Pay attention to refitting bigfoot. After understanding the basic label specifications of tires, there is a set of interchangeable tires to follow if you want to choose to replace tires. It should be noted that the diameter and height of the tire should not exceed 20 mm when replacing the tire, and the enlarged tire size can only be replaced within the allowable range. The calculation method is: (Tire height &; Times; 2)+ tire diameter (mm)= rim diameter height. Take 185/65HR 14 tire group as an example (120.22)+355.6=596mm, so the diameter height is185/65hr. According to the above formula, we know that 195/ with diameter and height of 609.2 can be used under the limitation of tire height. Then you can use 195/60R 15 tire, and the tire diameter and height are 615 mm. Because the difference between the diameter and height of the two sets of wheels is basically within the allowable replacement range of 20mm after replacement, they can be replaced with each other, and readers can replace them themselves.
First of all, we need to know whether the tire size provided by the original factory is for cost consideration or whether it represents sufficient size. The answer must be 50/50. Therefore, under the premise of not improving the power, the modification should be in the same size direction, but some high-horsepower cars have larger output wheels, and the original factory did not increase the tire size for their high-horsepower output. At this time, we can consider modifying the output wheel with larger size. Besides, you know what? The original factory itself has also considered the tire rim matching that the chassis can withstand. I think if the pressure on the chassis is not too great, switching to high-grade tires of the same size will have many positive benefits. Moreover, the regular replacement position of tires can increase the service life through its balanced wear, and the replacement method can be switched back and forth on the same side, and the switching time is similar to the time when you change the oil. Did you change the oil? Go adjust the tires!
The replacement of rims and tires is one of the basic projects of automobile modification. Whether it is a friend who likes to upgrade power or a friend who likes to improve handling, it is basically necessary to upgrade tires and rims. Because the modification of tires and rims is not only the most direct way to reflect the personality of small partners, but also only by improving the specifications of rims and tires can we effectively increase the grip of tires and avoid the phenomenon that tires slip out of control (of course, friends who like to play tail-flick and sideslip are another matter).
In addition to damage, the most critical purpose of most small partners to replace rims is to pursue diversified changes in appearance or meet special functional requirements. If it is purely for the pursuit of appearance change, most people will basically choose an enlarged rim except the original size rim. Because the larger rim is more beautiful visually, it can provide better handling stability, killing two birds with one stone. However, it is necessary to pay attention to the corresponding conversion method when replacing the big rim. Only after conversion can the appropriate tire be selected, otherwise the speedometer display will be incorrect.
Another alternative is to pursue the lightweight of the wheel rim, so as to reduce the suspension weight of the automobile itself, which can effectively improve the reaction speed of the steering, suspension and braking parts of the automobile and greatly improve the maneuverability. However, due to strict materials and high manufacturing technology, the cost of lightweight rims will be higher than that of most rims, and the price will be quite expensive. Moreover, the lightweight design will cut off the redundant part of the rim, so the design will be monotonous. Most competitive models will basically choose lightweight modification of rims.
To understand the rim, let's first understand the manufacturing process of the rim. At present, the wheels we can see can include iron wheels and aluminum alloy wheels. Because iron wheels are on the verge of extinction, we focus on aluminum alloy wheels. The manufacturing methods of aluminum alloy wheels are often encountered, including forging, molten soup forging, low pressure casting, molten soup casting, inclined casting and gravity casting. Forging is the most rigid and the lightest. Forging is to extrude the whole aluminum ingot through a die with a weight exceeding 1000 tons (the manufacturing pressure can reach 1.6 times; 07 N/cm2, while the density of the casting is only 2.2 kg/cm3), which will average the overall density of the rim, improve the material strength and reduce the weight. Take 15 inch aluminum alloy rim as an example. The weight of products produced by professional rim manufacturers can be adjusted to 3.6~3.8 kg, which is more than half lighter than other manufacturing methods, but the manufacturing cost is 4~5 times higher than that of castings, and the price is amazing. As for low-pressure casting, it is a compromise. The manufacturing process is to melt aluminum and other metal alloys into liquid state at high temperature, and then inject them into the mold for molding. This can not only achieve the purpose of high strength and light weight, but also adjust the manufacturing cost. It is the mainstream manufacturing process of most modified rims at present.
When choosing the aluminum alloy rim that needs to be replaced, we should not only choose the style we like, but also pay attention to the relationship between the shape of the aluminum ring and the heat dissipation efficiency. The shape of the rim determines the heat dissipation efficiency of the braking system, so it is very important to choose a reasonable rim shape. Here to help friends analyze the relationship between the types of rims often encountered in the market and heat dissipation.
1. The traditional multi-claw design adopts the traditional thin strip five-claw or six-claw design, which is a classic look and feel style, and this design is very helpful to the heat dissipation efficiency of the brake system. As for the 1.3-claw or 4-claw rim, although the problem can be solved and the heat dissipation is better, its torsion and impact resistance and strength are worrying because there are too few supporting spokes in China and the road conditions are not good.
2. The radial line type adopts multi-spoke or even branch design, which gives people a very dynamic feeling, and its balanced and symmetrical carving space is very helpful for heat dissipation.
3. How big the wrapped spokes are, it feels luxurious and upscale, but it has no effect on the heat dissipation function, and some will have the effect of heat gathering because of the connection of shapes.
After changing the aluminum ring, everything is not very good, but it needs to be tested well so as not to worry about the use. It is necessary to start testing whether the wheel carrier will grind brake cylinder, damping or suspension system components. In addition, it is also important to increase the size of the rim. The tire bead should not protrude from the front fender, so as to avoid friction between the tire and the fender when driving or turning, damage the tire, and even cause dangerous accidents such as puncture. Secondly, after a period of exercise, it is necessary to regularly check whether the balance lead block and nut are lifted or dropped. In addition, is there any abnormal expansion of the tire wall? Generally, this phenomenon is caused by the broken steel wire on the tire wall, where it was violently hit. Of course, the roundness of the rim at this position will also be affected. This is a direct method to detect whether the rim is deformed. If the rim is cracked, even if the repair welding is done well, the strength will be greatly reduced. It only needs to collide again and again, and it will be broken again and again at any time. It's better to change it for safe driving.
After talking about rims, we need to know more about tires. Can't live without tire rims. Only a comprehensive and reasonable upgrade can achieve the ideal modification effect. There are two principles for tire upgrading:
First, the perimeter remains the same.
For rims, the most important thing is to determine the specifications of the original tires first. Changing tires with different specifications will affect the accuracy of the timetable and the performance symptoms may not be perfect. Every tire basically has its specifications. Regardless of the brand, model and performance of the tire, at least confirm the specifications of the original tire first. The size of the tire circumference is basically related to the accuracy of the instrument, so whether you keep the original specifications or replace a wider tire, you should basically keep the tire circumference unchanged or change it as little as possible. The method to calculate the circumference is to multiply the pi by the diameter of the circle. In other words, the only variable that will affect the tire circumference is the tire diameter.
How to calculate the tire diameter? Very simple, that is&; Ldquo rim diameter+tire width x flatness rate x2 &；; Rdquo, take the tire size 185/65R 14 most commonly encountered by domestic cars as an example:
14 inch (rim diameter) x25.4+ 185 mm (tire width) x0.65 (flatness) x2 = 355.6.
Mm +240.5 mm = 596. 1 mm, which is the tire diameter (14x25.4 is the unit converted from inches to millimeters).
If it is necessary to widen and enlarge tires instead of replacing tires with similar specifications, the above formula can be used to calculate, as long as the tire diameter error is within 2%, it is basically acceptable.
In addition, the width of the tire must also be considered. If you don't care about performance and visual effects and just want to save fuel, you can change the narrow tires. Most consumers will basically widen the tires, which will improve the visual effect, tire grip (friction coefficient) and tire wall deformation. Although the fuel consumption and road noise increase correspondingly, compared with the improvement of grip and stability after replacement, such a sacrifice is still worth it.
Second, driving style and driving environment
The specifications are determined, then you need to consider your actual driving situation.
If you drive just for daily traffic, or often drive long distances, then the comfort and quietness of the tires are the key points that must be paid attention to. Comfortable tires are a good choice. The flat rate of this kind of tire will not be too low (at least above 0.55), the pattern is quite fine (mainly symmetrical or unidirectional tread pattern), and the sidewall is soft.
If you like to drive fast, often turn at high speed, start quickly and brake suddenly, then the key to tire performance is that you must sacrifice a little driving comfort and tire wear resistance (mainly one-way tread) at this time. Of course, the price of high-performance tires will be relatively high.
If you are located in a wet and rainy area, tire drainage will be particularly important. For safety reasons, it is recommended that you choose a set of wet tires or wet tires.
If there is snow all the year round in your area, it is best to choose snow-resistant tires to increase the contact area or improve the grip.