The material of the frame is divided into steel, aluminum, titanium alloy, and carbon fiber. Among them, the steel frame is the cheapest. My one is the one, but it is also the heaviest. The paint on the surface will be rusty after peeling off, so it takes more time to maintain it. The more advanced point is the aluminum alloy, which is lighter in weight but requires a thicker pipe diameter to achieve the same strength as the steel pipe, which is used by most mountain bikes. After the surface is polished, the whole car is silver-white, which is very beautiful. The characteristic of the carbon fiber frame is that it can be integrally formed without welding, but each frame requires a special mold to manufacture, and the cost is also high. Titanium alloys are not only light-weight, rust-proof, high-strength, and have the best material characteristics, but the raw materials are expensive and difficult to process, and it can only be purchased at least tens of thousands.
The height of the seat cushion has a great influence on riding comfort. The calculation method is to take your stride length * 0.883, which is equal to the distance from the seat cushion to the center of the chainring. There is also a relatively simple method, that is, people sit Go to the seat cushion and step on the pedal farthest from the body. At this time, after the foot is straightened, the heel must be able to step on the pedal exactly, pay attention to the heel. If the heel is not stepped on, the cushion is too high, and the knee is not straight, it is too low. One thing to note is that the height of this cushion is much higher than the riding height that most people are used to. When parking, even the toes of the single footpad are needed to get to the ground. When you first start riding, you will not be used to it. Be careful where there are many traffic lights. However, for long-distance riding, this height allows your legs to provide the best force on the pedals. So if your bicycle is only a few hundred meters in class, for safety, do not adjust the seat cushion so high.
The average person rides a variable speed bike, and when he wants to ride a slow gear, he adjusts to a light gear ratio, and when he wants to ride a fast gear, he adjusts to a heavy gear ratio. The correct method is to maintain a certain pedaling speed, usually 90 revolutions per minute. When riding stably at this rate, if you find that your feet are a bit strenuous and you can’t step on that fast, you should change to a lighter gear ratio, otherwise, change to a heavier gear ratio, so that the legs always maintain the same force This is the correct method of operation for the variable speed system. Therefore, 21, 24, and even the latest 27-stage shifting, not to provide a larger shifting range, but to provide a finer shifting in the same range to maintain the stability of the pedaling speed.
Of course, the most expensive cannot represent the best, suitable for yourself. Like is the most important. With the advancement of technology, I believe that a better performance frame can be developed.
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