![]() ![]() “Effective MOI is the informal consumer marketing term. “The key is moving the shaft away from the CG,” says Rife. The effect is a putter that feels more stable to the golfer during their stroke. “Effective” MOI is something Rife has been experimenting with recently, most notably with his ER1TS design, which features a large amount of offset between the shaft and the head. It wouldn’t twist much on off-center hits, but you’ll have no touch or distance control.” Other technology can have an MOI-boosting effectĪlthough increasing MOI is the primary way to reduce the punishing effects of mis-hits, putter designers can also increase forgiveness in other ways. “Think about if you were putting with a brick. “You can cheat MOI by adding a lot of weight,” Rife says. If increasing and decreasing MOI is a matter of moving weight around the putter head, simply adding weight to the putterhead can work - but at a cost. Have you heard our new “Subpar” series? Check out the first installment featuring John Rahm below!ĬLICK HERE TO STREAM THE FULL SUBPAR INTERVIEW WITH JON RAHM ON SOUNDCLOUD So if you use one, you better be sure you hit the sweetspot of the putter consistently. His newer Outback design features an aluminum body with a steel boomerang fastened to the underside of the putter for the same reason, Rife says.Īn old-school blade putter, by contrast, has less heel-toe stability, and therefore is prone to twisting. Mass can be distributed to the corners and sides for even higher MOI.”ĮVNRoll’s ER9 10k putter (the 10k stands for 10,000 MOI) has since been discontinued but is still popular in Germany - “The Germans love how stable that thing is,” Rife says - features a lighter-weight aluminum body, a hollowed-out center, and two steel rods to increase MOI. “When you move mass to the toe and heel of a blade putter, that will create more resistance to twisting. “MOI increases when you redistribute the weight outward and away from the center of mass or CG of the putter head,” Rife says. ![]() ![]() But how do putter designers actually increase MOI? A higher MOI putter decreases the amount the putter twists. The opposite occurs when the ball is hit more towards the heel of the putter. This causes the ball to lose distance and travel away from the center target line. When the ball is hit off the toe of the putter face, the impact with the stationary ball means the blade will deflect and open slightly. “The higher the MOI, the more resistant the putter is to twisting.” Different head designs increase and decrease MOI “MOI is a measurement of a putter face’s resistance on off-center hits,” Rife says. A putter with high MOI won’t twist as much as a putter with low MOI. The more the putter’s mass is located away from the center the higher the putter’s MOI. The MOI machine measures the amount of resistance the putter head creates each time it changes direction. The way it works is that an un-shafted putter head is placed on a central disk so that the putter head’s center of mass (CG) is directly in the center of the disk. Every putter has it, and you measure it using an MOI machine. MOI measures how much the putter twists on off-center hits MOI is a driving force behind Guerin’s designs, so I asked him for an explanation about what it is, and how it can help golfers. He invented Rife’s innovative two-bar technology, and is the mind behind EVNRoll’s line of putters. It proved so once again when I called up Guerin Rife, one of the smartest men in putting and, indeed, golf. I haven’t had much luck with that second part, but the first part works flawlessly. Maybe if I keep digging, I’ll learn about something I never knew before, and bingo! My putting woes will be a thing of the past, and my game will hit a new level. When it comes to putting - the area of my game which is the most troubled - I tend to run down some pretty nerdy rabbit holes. ![]()
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