20 19 Merida Challenger 900, is it worth buying? Merida SL7-N which is better?

These are two things that Merida does market segmentation. There's nothing better. You can only decide which one to choose according to your riding taste and style. Because they are all designed for the domestic environment, the frame geometry and technology are the same (they are all European version 7 frames of 20 17 "castrated" and released to China after canceling the boost specification), but the difference is: 1, the paint water material of the frame is different, x00 (including 900) is traditional paint, and SL (including SL7) is changed to direct anodic oxidation frame (. . 2. The design purposes are different, so the speed change and transmission system are different. X00 continues the traditional "multi-gear" style, which is suitable for "mountain horse" and "riding" sometimes playing cross-country, but not for violent cross-country (when the multi-gear bumps badly, it may change gears, leading to "chain jumping" accidents). Pick SL7 adopts a brand-new mainstream single-toothed plate (namely "1x speed change system"). The toothed plate is of positive and negative teeth, which prevents chain jumping and is suitable for off-road play in bumpy terrain. Advantages of multi-disc and single disc: fast cross-country speed change (without left finger and front finger, just focus on the speed change of right finger, and the left hand can be used to lock the shock absorber fork), reducing chain jumping, facilitating maintenance and reducing weight (about 500g). Disadvantages of single disc: the flat speed is not as good as that of multi-disc (under the same pedaling output, the number of teeth of single disc is only 32t or 34t, while the maximum number of pieces of multi-disc is 36t and 38t). . . In addition, several sl lines are "lightweight", so the wheelsets are also "mountain horse" type (for example, the tires are Hayabusa 299 ultra-light mountain horse tires), which is not suitable for cross-country. For the SL7, which mainly focuses on cross-country, it is necessary to change the thick-toothed tires-note that this is a design contradiction (Merida has hydrocephalus from time to time; The giant's car wouldn't have such a mistake)

Tooth plate of multi-piece transmission system (the picture shows two tooth plates, which are basically the same as those of 900). At the top of the chain is a forward dial (connected with the left finger dial by steel wire). At present, the mainstream of multi-disk system is 2-disk, and 3-disk is almost eliminated. The main advantage is that the road leveling speed is fast (single-disk system) and the climbing ability is no less than that of single-disk system, but playing cross-country is more complicated.

Single board (1x) system tooth board (SL7/SL7-N is very similar to the figure). For cross-country and climbing big slopes, the single tooth plate is small, and the number of teeth is mainly 30T, 32T or 34T. When you step on the road at a speed of 32T and 25km, your legs will rotate like mud, making it difficult to get up quickly (but the small teeth are very good at cross-country and climbing), and 34T will not be much faster. "1X system" was another big brand SRAM (Speedlink) in that year, and now it has developed to the speed of 12. In 20 18, there were more than 50 first-line and second-line mountain bikes in Europe and America, and most of them used Speedlink's 12 speed kit (Simano in June and July of 19). However, the "1X system" has flourished in developed countries in Europe and America (the natural environment is well protected and developed, there are many wild places where mountain bikes can be played, and many "mountain bike parks" have been built), but it is not necessarily suitable for countries lacking wild places and mountain bike parks (except Yunnan, Sichuan and other mountainous areas). If you buy a mountain bike but have no place to play cross-country, you'd better not pay the bill.

Of course you can improve yourself. For example, you can change the double disc into a single disc, you can press the road at a certain speed, and you can also cross the road (there are certain requirements for control technology and leg strength, but you can't climb down a big slope): this is my own SL, and the toothed disc is a single disc with 38T positive and negative teeth, which is used for riding on the road.