I understand that the bulge and roll on a driver produces a gear effect which helps to correct off center hits.  Is there an industry standard or do different manufacturers have differences in bulge and roll?  I have a Mizuno 10.5 degree loft and a Cleveland 10.5 degree loft and I find the Mizuno to be more forgiving.  Both clubs have the same shaft so they are in essence equal except for what appears to be the amount of bulge and roll.  The Mizuno looks to have more bulge and roll while the Cleveland looks to be more straight faced.  The amount of bulge and roll does not appear to be something that is listed in club manufacturer’s specifications.  Also, do you have a tool for measuring this?

Britt Lindsey Answered question September 16, 2022