RD-TX800 rear derailleur for 7/8-speed features Shimano's double servo-pantograph technology that improves adjustability and resists weather and contamination. The derailleur always keeps close to the cassette sprockets, allowing smooth and effortless gear changing. The overall capacity amounts to 43 teeth.
| Model No | RD-TX800 |
| Series | TOURNEY TX800 Series |
| Color | Black | Silver |
| Cable adjuster | |
Compatible chain | HG 8/7-speed | | Direct attachment (Conventional) | |
| Low sprocket_Max. | 34T |
| Low sprocket_Min. | 28T |
| Max. front difference | 20T |
| Pulley_Teeth | 13/13T |
| Pulley cage | SGS |
| Rear speeds | 8/7 |
| Top-Normal spring type_W servo | |
| Top sprocket_Max. | 14T |
| Top sprocket_Min. | 11T |
| Total capacity | 43T |
