- Low profile shadow technology
- Straight cable design. Crisp and accurate shifting. No chain stay contact. Stronger guide spring.
- Weight : 260g (45g lighter than M581)

SLX features Shimano's Shadow design Rear Derailleurs for superior trail clearance and crisp shifting.
Features
Specifications
| Model Number | RD-M662-SGS |
| Series | SLX |
| Shifting Action | Top Normal |
| Mount Type | Drop-out |
| Maximum Sprocket | 34T |
| Minimum Sprocket | 11T |
| Front Difference | 22T maximum |
| Total Capacity | 45T |
| Guide Pulley | |
| Tension Pulley | |
| Pulley Bolts | |
| Pulley Bolts Retainer | |
| Bracket Body | aluminum/painted |
| Bracket Pivot Seal | |
| Plate Body | aluminum/painted |
| Plate Pivot Bolt | |
| Plate Pivot Seal | |
| Outer Link | aluminum/painted |
| Inner Link | steel/painted |
| Link Pin Bushings | fluorine coated (2) |
| Outer Plate | steel/painted |
| Inner Plate | aluminum/painted |
| Average Weight | 258g |