In order to properly convey the product smoothly and efficiently, it should be supported by a minimum of three rollers. To calculate the center to center roller spacing required, divide the length of your package by 3. The dividend is your required spacing. For example, a package 12" long when divided by 3 yields a dividend of 4. Therefore, the required spacing would be 4" center to center. Flexible bottom surfaces require four or more supporting rollers per package, calculating spacing would require the same procedure.