# Editing gears

Editing the properties of one gear in a pair may or may not affect the properties of the other gear.

1. Tooth number: Changing the number of teeth in a gear changes its diameter. The other gear is unaffected.
2. Diameter: Changing the diameter of a gear changes its number of teeth. The other gear is unaffected.
3. Tooth size: Both gears in a pair always have the same tooth size. Changing the tooth size of one gear changes the tooth size of the other gear.

## See also:

- Gear pairs