What do you need to change from threaded to threadless on a scooter?

To change from a threaded to a threadless headset on a scooter, you will need a new threadless headset, a compatible fork (as threaded forks are not compatible with threadless headsets), and a suitable stem. You'll also need to remove the old threaded headset and fork, install the new threadless headset, and ensure that everything fits securely. Finally, adjust and tighten the stem to complete the conversion.