1. pressione delle gomme   tire pressure   tricycle   pump   shock absorber   Hint Half-n-half Clue   2. freno a mano   helmet   gear lever   lock   handbrake   Half-n-half Clue   3. dente di ruota   scooter   sprocket   helmet   seat   Half-n-half Clue   4. ammortizzatore   motorcycle   valve   shock absorber   helmet   Half-n-half Clue   5. triciclo   engine   tricycle   chain   gear lever   Half-n-half Clue   6. raggio   shock absorber   helmet   pedal   spoke   Half-n-half Clue   7. freno   horn   tire pressure   brake   motorcycle   Half-n-half Clue