Shimano - REAR DERAILLEUR, RD-M3020-8, ACERA, SGS 7/8-SPEED, DIRECT ATTACHMENT, BLACK
| Cage Length | SGS/Long |
| Total Capacity | 45T |
| Max Front Difference | 20T |
| Cable Adjuster | X |
| Color | SERIES COLOR |
| Mount | Direct attachment (conventional) |
| Number Of Pulley Teeth | 11T |
| Series | Acera |
| Generation | M3000 |
| Max Low Sprocket | 40T |
| Min Low Sprocket | 30T |
| Rear Speeds | 7/8 |
| Top Normal Spring Type | Double servo |