Other than strongman training or for the purpose of an increased grip/forearm size, there would not be that much value for using a extra thick bar. Doing the much overlooked reverse BB curl for building the forearms (alternate a false grip..thumbs over/under the bar) and strength serves the purpose for most BB'ers. If you want to try the feel of a thicker bar, without buying one first, than you might consider the following. Go to a building supply store and buy a 2"-2 1/4' plumber pipe. They will cut to size for you. Remove the collar on one side of your bar and slide the pipe through. Replace the collar (probably need a hex nut wrench). Add weight to the bar and lift. Good Luck.