December 6th, 2011 | Published in Ball Reviews
52 Hook 14.5 Length 14.5 Breakpoint Shape
Manufacturer’s Intent: Scott Hewitt said this about Motiv’s Sigma Tour: “Professional bowlers asked our creative engineers to give the Sigma core a new shell that would provide 3-4 feet more length on a medium or broken-down condition, and a stronger back-end motion with continuation. They wanted to chase the pattern and still get the ball to corner hard. Our engineers delivered with the Atomix Reactive coverstock.”
Core Design: The Nuts asymmetric core encourages late midlane revs and downlane angularity. The RG is medium-high at 2.55, the Diff strong at .050, and the mass bias is .017. We saw nearly 6” of flare with strong layouts.
Coverstock: The Sigma Tour’s coverstock is 2000 wet sanded but has the appearance of a light sheen. Responsiveness off friction is moderately quick, and oil traction is above average with box finish.
Test Results: The Sigma Tour is everything a bowling ball needs to be: release friendly, offers predictable motion, adaptable to numerous oil volumes and oil pattern shapes — and all with superb pin carry throughout the oil transitional phases. Whew, that was a mouthful, but it’s the way we saw this ball. Motiv has long been known for quality and predictability throughout its product line. The Sigma Tour and Raptor (August) bring an added dimension of power and attitude in the last 20 feet of the lane. The covers have become more responsive, and the cores supply easy and ample revs to help carry power.
When to Use: The Sigma Tour matches up well on most medium to medium-heavy volumes with either clean or dirty (oil carrydown) backends. The strong arcing motion with strong midlane revs helps players see the motion easily and correctly. Drier patterns could cause some early read for rev-dominant types, but we rarely saw this cause problems. You could simply move deeper inside the oil pattern to help delay the cores’s dynamics. The latest and strongest reaction was the 3” pin distance, while the 5” had the “rolliest” back-end shape by far in the last 20 feet of the lane.