| Manufacturer | BRIDGESTONE | |
| EAN | 3286340844611 | |
| Manufacturer article number | 8446 | |
| Trade name or trademark | BT S21 Rear | |
| Tyre size designation | 180/55 R17 73 W / ZR | |
| Tire type |  |
Summer |
| Tires suitable for use in extreme snow conditions |
No | |
| Speed category symbol | W / ZR | Approved up to W / ZR.label km/h |
