Solved
Writing spatial index on File geodatabase with a specific grid size

Writing spatial index on File geodatabase with a specific grid size
Best answer by mark2atsafe
I don't have ArcGIS installed right now, so I can't give you a screenshot (because w/o ArcGIS I can't create a Geodatabase Writer in FME) but you should open up the table definition in FME by clicking the cog icon on the Writer table objects. Then click the tab labelled Format Parameters. In there you should find some settings to control the grid size.
See this page for more info:
Reply
Rich Text Editor, editor1
Editor toolbars
Press ALT 0 for help
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.