The new standard in high-quality downhill and freeride rear derailleurs! New chain control and noise-damping technology, specially designed for Saint, makes its debut on the new Saint Shadow Plus RD-M820 short cage. Unique features include a new silent shock stop, Shadow Plus chain control technology and a cassette shifter. - For 10 speeds only 1. Shadow Plus RD technology from Shimano : super-low-profile design with integrated chain stabilizer 2. Extra-large links: for a rigid structure that prevents twisting and improves durability 3. Integrated shock protection: protects the rear derailleur in the event of an impact 4. SHIMANO Shadow Plus rear derailleur with short cage prevents chain slap and rebound 5. Rubber shock absorber reduces noise on rough terrain 6. Heavy-duty wide linkage 7. Mode converter - "Wide" mode for FREERIDE >11-32Z - "Narrow" mode for DOWNHILL 8. Application: downhill/freeride 9. series: Saint 10. Model: RD-M820 11. Speeds: 10 speeds 12. Min. teeth large sprocket: 28 teeth 13. Min. teeth small sprocket: 11 teeth 14. Max. Front differential: for single chainring 15. Rear derailleur material: painted aluminum 16. Parallelogram: lacquered aluminum 17. Derailleur cage plate: lacquered aluminum 18. Weight: 280 g