1. Entry level derailleurs are mostly used on bikes for beginners or recreational riders, and they are relatively inexpensive, but their performance and quality are more average.
2. Mid-range level derailleurs are suitable for general riders, are moderately priced, and have better performance and quality than entry-level derailleurs.
3. High-end level derailleurs are suitable for professional riders or enthusiasts, with higher prices but excellent performance and quality.
4. Professional grade derailleurs are used by professional bike racers and are very expensive, but the performance and quality are also top of the line. Different grades of Shimano derailleurs are suitable for different usage scenarios and needs, and consumers can choose the right grade according to their needs and budget. At the same time, for those who love their bikes, choosing the right grade of Shimano derailleur can also prolong the life of the bike and improve the comfort and safety of riding.