Features: Equipped with excellent variable speed performance for easy and smooth operation. The extensive connection design ensures accurate speed and durability. To ensure accurate gear shifts, and less pedal power loss and more accurate speed control. Improve the speed response and extend the service life. This rear derailleur is suitable for mountain bikes, folding bikes, etc. Please note: This is a high-quality aftermarket/compatible replacement part, not an original product. It is precision-engineered to fit and function perfectly as a replacement for the RD-M390 model. .
