Forgiveness · High MOI
High-MOI Putters,
Stable on Every Strike
MOI is a putter's resistance to twisting on a mishit. Ashdon builds it into the shape — for a sweet spot 3× larger than a traditional putter.
Moment of inertia — MOI — is a putter's resistance to twisting when you don't strike the ball dead center. The higher it is, the more a mishit still rolls true. Ashdon builds MOI through geometric mass distribution: using the putter's shape — triangles, arcs, perimeter edges — to position mass at the extreme outer boundaries of the head rather than concentrating it in the center. Every gram of weight is placed where it creates the most moment of inertia.
Pushing that mass to the edges expands the effective hitting zone dramatically. Where a traditional putter's sweet spot is about the size of a penny, Ashdon's geometric architecture creates a zone roughly 3× larger — big enough that even mishits stay on line and on pace. You don't have to find the center; the center finds you.
The same geometry that raises MOI also keeps the face square, reducing torque by 87% versus conventional putters. Every head is CNC-milled from solid 303 stainless steel and 6061 billet aluminum to tolerances tighter than ±0.001″, and every model is designed to conform to USGA and R&A rules.
The Collection
Engineered for Maximum Forgiveness
Bermuda Triangle Caribbean Blade
$299.95
Roundabout Ballistic Missile G-360 M6 Mallet
$349.95
Bermuda Triangle Ballistic Missile G-360 M5 Mallet
$349.95
Roundabout Mallet
$299.95
Roundabout Guided Missile M3 Mallet
$299.95
Bermuda Triangle Grand Bahama Mallet
$299.95
Bermuda Triangle Blade
$299.95
Roundabout Blade
$298.98
Bermuda Triangle Long Island Mallet
$299.95
Roundabout Guided Missile M4 Mallet
$299.95
High-MOI Putters, Answered
What is a high-MOI putter?+
MOI — moment of inertia — is a putter’s resistance to twisting when the ball is not struck exactly on the sweet spot. A high-MOI putter resists that twist, so an off-center strike still rolls straighter and holds its pace. It is the single biggest driver of forgiveness in a putter.
What is geometric mass distribution?+
Geometric mass distribution means using the putter's shape — triangles, arcs, perimeter edges — to position mass at the extreme outer boundaries of the head rather than concentrating it in the center. This dramatically increases the moment of inertia (MOI), which is the putter's resistance to twisting when the ball isn't struck exactly on the sweet spot. Higher MOI means straighter roll, more consistent distance, and fewer three-putts from slight misses.
Does higher MOI help on off-center putts?+
Yes — that is exactly what MOI is for. By distributing mass along the outer edges, Ashdon expands the effective hitting zone dramatically: the sweet spot is roughly 3× larger than the penny-sized zone on a traditional putter, so even off-center contact rolls truer and travels farther. You don’t have to find the center — the center finds you.
Are Ashdon putters USGA approved?+
Yes. All Ashdon putters are designed to conform to USGA and R&A equipment rules and are legal for tournament play at all levels. The Roundabout Series geometric head design is patented (U.S. Patent US5599241A).
Other Categories
Compare Head Styles
Zero-Torque
Geometry that resists twisting — 87% less torque than a conventional putter, so the face stays square.
View Zero-Torque Putters →Mallet
More mass, further from the center. The largest, most stable head Ashdon builds.
View Mallet Putters →Blade
The classic narrow profile, rebuilt on Ashdon geometry. Feel players start here.
View Blade Putters →Not Sure Which Model?
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