The Chapin 8000A 65 - Pound Lawn Spreader spreads the granules in the front and on the sides. It does not spread in the back.
The manufacturer of the product you are applying will supply the settings on the specific product label packaging. If your specifici spreader is not listed, then you will need to calibrate your spreader to determine the proper setting for the application.
View our How to Determine Spreader Settings Video for a short tutorial on this process.