LynnBlakeGolf Forums - View Single Post - A question for all you... Thread: A question for all you... View Single Post #3 12-28-2007, 04:10 PM blehnhard Member Join Date: May 2006 Location: Northern VA Posts: 34 Cog The amount of bulge and roll (if done properly) is determined by the location of the Center of Gravity in the clubhead. COGs more to the rear require more B&R. COGs closer to the face require for less B&R. Most metal heads have the COG closer to the face (reduce spin) so the need less B&R. B&R is designed to help reduce "gear effect" which is greater when the COG is farther from the face. Bruce blehnhard View Public Profile Send a private message to blehnhard Find all posts by blehnhard