there is no such thing as "how", except "cheap". One of the domestic small factories is following the trend, and no one cares about it in the cycling circle. Looking at the workmanship, paint water and accessories used on the surface of the frame (Jianda 7c tire, Xinlong handlebar group-this is a so-called Taiwanese brand, but it is actually made by ordinary domestic factories, but it is better than miscellaneous brands, Ximano entry-level kits, etc.), it is still more responsible than many miscellaneous brands. This kind of SPECIALIZED "road bike", if you ride it occasionally, it is ok to buy food and commute. If you want to "into the pit" (take road bike as a long-term sport/fitness/exercise/long-distance riding, or "play"/"fever" cycling), you must at least have a truly international or domestic brand of road bike, and there are complete official marketing and after-sales warranty channels in China. That is, "Thunder" (because the trademark is a lightning-like S), "TREK", that is, "Big Cui", "CUBE" (just introduced, but few models) and "Marin" (an old brand that is higher than Giant, but not many models have just entered China); Giant ("Huge" and "Big G") in Taiwan Province, China, not to mention this, is the representative of cost performance in China, Merida ("Tankeda"); The big name in China is XDS, with a bad nickname? For example, some cyclists in the circle don't like it very much because of the small diao silk), ZGL ("Piggy" and "Sitting on lao" are also the drag of the nickname, but the cost performance is still higher than that of Giant), China Attack (KUNG, the leading professional team brand in China, has a higher cost performance than Giant). . . The key to choosing/riding a road bike is to look at the "geometry", responsible and level brands, and each car will be accompanied by a "geometry map", because there are many types of road bikes (Tiesan, TT timing, racing, wind-breaking racing, pneumatic wind-breaking racing, climbing, endurance, long-distance, long-distance endurance, CX cross-country, and Gravel cross-country are all popular in Europe, America and some domestic regions. The riding experience is also different (for example, the speed of puma on a flat road, TT timing and pneumatic breaking wind racing are the fastest, and you can even get on a high-speed puma car, but you will kneel when you encounter a big climb. It is only right to ride a climbing road with many slopes, such as medium and long distance, long-distance riding or long-distance endurance, which will definitely be more comfortable than other types, and it is not easy to get sore all over). There is a height adaptation table in the geometric drawing, and the size of the car must match the height, otherwise, it will be uncomfortable everywhere, and it will cause riding injuries (knees, waist, cervical vertebrae, elbows and wrists, etc.). Therefore, for those who don't give geometric drawings, only one or two sizes promote the height from 1.55 short to 1.9 high, and can ride by adjusting the height of the seat cushion, just pass. . . . The size of a road car is 2cm in increments, and big brands generally have 5 to 8 sizes, so it is easy to adapt to their own height. . . Then, you must try to ride, especially novices, and don't buy cattle across the mountain. Because people's arm and leg lengths, psoas muscles, flexibility and coordination are different, even if they are 1.75 meters high and ride the same size, there will be some discomfort! Need the technician of the store to fine-tune the height and front and rear positions of some accessories. . . Finally, if you ride a road bike for a long time, you'd better go to a car shop with professional equipment to do a Fitting (what to teach fitting and search online is a very basic and important ergonomics and health and kinematics knowledge in the field of road bikes). . . If you think the above is too much trouble, or the investment can't bear it, then don't blindly follow the trend. Buying more than 1 giant entry-level mountain bikes, such as riding with ATX66, is more suitable for you!

= = The specific types and application of road vehicles are different (taking Lightning as an example) (Giant also has similar vehicle types differentiation):

= = Geometric diagram, this is an entry-level aluminum alloy road vehicle of Lightning, with 7 sizes.