Bowler Ratings


Bowler ratings are from 1 to 10 in order of Stroker (ST), Tweener (TW), Cranker (CR)

Note: Ratings are only available to our premium members.

General Info

Reviewed:February 2012
Coverstock Specs
Name:Microbite Solid Reactive
Type:Reactive Solid
Box Finish:3000 Abralon
Color:Blue / Purple / Black
Core Specs
Int. Diff:0.017

For details on our standard test layouts, please click here.

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

The BTM Ball Testing Team

About The BTM Ball Testing Team

The BTM Ball Testing Team is led by Eric Martinez. Our team of three testers has thrown and reviewed hundreds of bowling balls for Bowling This Month. When not testing balls for BTM, Eric owns and operates University Pro Shop in San Antonio, TX and he is an avid competitive bowler. Click here to learn more about how we test and review bowling balls.