| Model | RD-R8150 |
| Reference supplier | IRDR8150F |
| Practical | ROAD |
| Derailleur mount | Classique, Compatible Direct Mount |
| Yoke | Moyenne |
| Number of compatible speeds | 12 |
| Weight in grams | 262 |
| Technology | Shadow RD / DI2 |
| Détails | |
| Variator rollers | 11 dents |
| Small minimum sprocket | 11 dents |
| Large maximum sprocket | 34 dents |
| Maximum front tooth difference | 16 dents |
| Total capacity | 39 dents |
Shimano Ultegra Di2 rear derailleur (RD-R8150)
Gears: 12
Total capacity: 39 teeth
Maximum capacity: 34 teeth
Cage: average
Charging cable: EW-EC300
Technology: Shadow RD
Weight: 262g
Updated by E-tube project