Rear Derailleur for 1 x 6 / 7 Speed
Direct Attachment Type
Super Short Cage
Rear Derailleur for 1 x 6 / 7 Speed
Reverse Bracket Type
Super Short Cage
| Model No. | RD-M21SS | RD-M21SSA |
| Cassette Compatibility | 6 / 7 Speed | 6 / 7 Speed |
| Cage Type | Super Short Cage | Super Short Cage |
| Front Chainring | Single | Single |
| Max. Sprocket | 32T | 32T |
| Min. Sprocket | 11T | 11T |
| Total Capacity | 21T | 21T |
| Guide Pulley | Engineering Composite with Steel Bushing | Engineering Composite with Steel Bushing |
| Tension Pulley | Engineering Composite with Steel Bushing | Engineering Composite with Steel Bushing |
| Bracket Body | Resin / Black | Resin / Black |
| Mount Type | Direct Attachment | Reverse Bracket Type |
| Bracket Pivot Seal | N | N |
| Plate Body | Resin / Black | Resin / Black |
| Plate Pivot Seal | N | N |
| Outer Link | Resin Steel | Resin Steel |
| Inner Link | Black Steel | Black Steel |
| Link Pin Bushing | N | N |
| Outer Plate | Black Painted Steel | Black Painted Steel |
| Inner Plate | Black Painted Steel | Black Painted Steel |
| Weight | 241g | 241g |
| Compatibility | Shimano 6 / 7 Speed Rear Derailleur Compatible | Shimano 6 / 7 Speed Rear Derailleur Compatible |
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