I have purposely set the serving size fairly small to 2 tablespoons or 28 grams, but one could potentially have a larger quantity for a low FODMAP serving. There is no easy answer to this as pickled cucumbers have not yet been tested in a lab for FODMAPs. Some varieties of cucumber have been tested by Monash University, have been found to contain the FODMAP fructose and have a low FODMAP serving size of 1/2 cup or 75 grams; however, its impossible to determine the impact of the brining process on the quantity of FODMAPs without lab testing. Here is a great article by a registered dietitian on how to test your FODMAP tolerance for untested foods.