The Defiant is the first in a new line of bowling balls for Roto Grip. The new Royal line is a line that Roto Grip has used on overseas releases and now they are bringing it to domestic markets. This core/cover combination creates the most overall hook we have seen from Roto Grip.

In our testing, we found the Defiant to match up best with our heavy test pattern. Stroker, Tweener, and Cranker all had a terrific overall reaction while this pattern was fresh. Stroker’s ball reaction got even better as the session progressed due to the oil breaking down. The Defiant carved up our heavy test pattern for all three testers. Throughout the testing session, the Defiant just got stronger and ...