Bowler Ratings

PatternStTwCr
Oily:X.XX.XX.X
Medium:X.XX.XX.X
Dry:X.XX.XX.X
Sport:X.XX.XX.X

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

Note: Ratings are only available to our subscribers.

General Info

Coverstock Specs
Name:Microbite Pearl Reactive
Type:Reactive Pearl
Box Finish:1500 Grit Polished
Color:Red / Black / Electric Blue
Empty
Core Specs
Name:NA
Type:Asymmetrical
RG:2.49
Diff:0.054
Int. Diff:0.017

The Defiant Edge is the first ball in the newly named Roto Grip HP4 line. Starting this summer the Shield, Sword, Crown, and Royal lines will no longer be the categories describing the price points for Roto Grip bowling balls. Instead, balls will be categorized into price points by the new naming system entitled HP (Hook Potential) followed by the number of the range in which they fall. There will be four HP lines, one being the lowest entry level performance ball and each step offering stronger core and cover combinations.

The strong pearl cover and Paragon core gave us the best reaction on the medium test pattern. We saw the Defiant Edge tumble through the front and the motion ...

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.