What is a synonym for rim?

Here are some synonyms for "rim", depending on the context:

General:

* Edge

* Border

* Margin

* Flange

* Circumference

* Perimeter

* Outlining

* Boundary

Specific to wheels:

* Wheel edge

* Wheel flange

* Bead seat

* Lip

Other:

* Lip (for a cup or bowl)

* Brim (for a hat)

* Verge (for a cliff)

The best synonym for "rim" will depend on the specific context in which you are using the word.