Ninja RPM

Introducing the Ninja RPM™ from AMF.

More revs than you ever thought possible. More hook than you ever thought possible. More hitting power than you ever thought possible.

How is this possible? Put simply, the new Ninja RPM is a technological breakthrough that turns the laws of physics to the advantage of bowlers in ways no one has ever done before.

We started with a simple truth: MORE REVS = MORE HOOK. The more a ball turns over, the more potential it has to hook. The question was how to help bowlers create more revs on a variety of lane conditions, including the heavier oil conditions that are prevalent today. The AMF ball-design team headed by Mo Pinel found the answer in a revolutionary new ball design.

Based on the tremendously successful, patented Ninja core design, the team created a dual-shell ball around a single-density, tapered core. By doing this, they were able to concentrate mass toward the center of the ball for a low moment of inertia, allowing the ball to rev faster at the release. At the same time, the ball maintains a strong preferred spin axis. This combination increases the ball dynamic known as track flare—in this case, producing the most effective track flare ever.

Thanks to its strong flare potential, the Ninja RPM continuously migrates to a new axis. Because the RPM constantly tracks on a clean area of the ball’s surface, friction is more easily maintained—resulting in more revs and a long, even arcing hook with a consistent break point.

By using suggested drilling techniques, a skilled ball driller can adjust the amount of track flare to suit each bowler. The Ninja RPM also features the latest in performance-integrity technology, with core densities carefully adjusted to maintain consistent performance characteristics across all ball weights.

The physics of the RPM may seem complex, but the results are not. More revs. A huge, controllable, even arcing hook. And high friction on the backend. For bowlers, it all adds up to one thing: more pins per frame.

The RPM’s amazing performance, vivid colors, and the placement of its multiple logos make it truly unique. When this ball revs, the whole world will notice.

The revolutionary new Ninja RPM. Proof that, while the laws of physics may never change, AMF bowling technology just keeps getting better and better.

"Rev it up! This ball will rev faster at the release and rev more on the back-end. Bowlers now have a very controllable, reactive ball that’s less sensitive to changing lane conditions, even tremendously oily or carry-down—and it’s extremely versatile. The RPM gives bowlers the opportunity to move to a higher level of performance." - Mo Pinel Ninja RPM Ball Designer

The Ninja RPM is designed to produce maximum revolutions, creating an enormous, even-arcing, controllable hook with maximum friction for power on the backend. It is an excellent choice for heavy oil and changing lane conditions.

The Ninja RPM’s unique core construction creates a low moment of inertia and a strong preferred spin axis so the ball revs faster and develops more total area of friction.