| Clue | Source | Date |
|---|---|---|
| Wheel notches that engage with a drive chain (9) | ||
| From space launchers, one removed teeth (9) | ||
| Film projector teeth | Wall Street Journal | 23 Nov 2016 |
| Rock steps remodelled into wheel teeth | ||
| Toothy wheels | ||
| Ten-speed components | ||
| Some of a bicycle's wheels |