Single sprocket or sprocket units for the Ultegra CS-R8000 and CS-68000 11-speed cassettes.
| 11 teeth for 11-23, 11-25, 11-28, 11-32 teeth |
Y1Y911000 |
| 12 teeth for 11-23, 11-25, 11-28, 11-32 teeth |
Y1Y912000 |
| 12 teeth for 12-25 teeth |
Y1Y912100 |
| 13 teeth for 11-23, 11-25, 11-28, 11-32 teeth |
Y1Y913000 |
| 13 teeth for 12-25 teeth |
Y1Y913100 |
| 14 teeth for 11-23, 11-25, 11-28, 11-32, 12-25 teeth |
Y1Y914000 |
| 14 teeth for 14-28 teeth |
Y1Y914100 |
| 15 teeth for 11-23, 11-25, 11-28, 12-25 teeth |
Y1Y915000 |
| 15 teeth for 14-28 teeth |
Y1Y915100 |
| 16 teeth for 11-23, 11-25, 12-25, 14-28 teeth |
Y1Y916000 |
| 16 teeth for 11-32 teeth |
Y1Y916100 |
| 17 teeth for 11-28 teeth |
Y1Y917100 |
| 17 teeth for 12-25, 14-28 teeth |
Y1Y917200 |
| 18 teeth for 11-32 teeth |
Y1Y918200 |
| 18 teeth for 14-28 teeth |
Y1Y918300 |
| 19 teeth for 14-28 teeth |
Y1Y919500 |
| 17/18 teeth for 11-23 teeth |
Y1Y998100 |
| 17/19 teeth for 11-25 teeth |
Y1Y998020 |
| 19/21 teeth for 11-28 teeth |
Y1Y998030 |
| 20/22 teeth for 11-32 teeth |
Y1Y998040 |
| 18/19 teeth for 12-25 teeth |
Y1Y998050 |
| 20/21 teeth for 14-28 teeth |
Y1Y998120 |
| 19/21/23 teeth for 11-23 teeth |
Y1Y998110 |
| 21/23/25 teeth for 11-25 teeth (CS-R8000 only) |
Y1WG98030 |
| 21/23/25 teeth for 11-25 teeth (CS-6800 only) |
Y1Y998060 |
| 23/25/28 teeth for 11-28 teeth (CS-R8000 only) |
Y1WG98040 |
| 23/25/28 teeth for 11-28 teeth (CS-6800 only) |
Y1Y998070 |
| 24/27/30 teeth for 11-30 teeth |
Y1WG98050 |
| 25/28/32 teeth for 11-32 teeth (CS-R8000 only) |
Y1WG98060 |
| 25/28/32 teeth for 11-32 teeth (CS-6800 only) |
Y1Y998080 |
| 21/23/25 teeth for 12-25 teeth (CS-R8000 only) |
Y1WG98070 |
| 21/23/25 teeth for 12-25 teeth (CS-6800 only) |
Y1Y998090 |
| 23/25/28 teeth for 14-28 teeth (CS-R8000 only) |
Y1WG98080 |
| 23/25/28 teeth for 14-28 teeth (CS-6800 only) |
Y1Y998130 |
