RG and Differential

[v33dubfox]

Hello. Because I am not bilingual, I've got some difficulties understanding what the RG and differential means. A lot of ball manufacturer don't translate those "numbers" into a common scale (like hook potential) so often, I don't really know if the ball seen on the internet would hook a lot or not, late or soon, etc.

Please can you help me with that?

[bowl1820]

RG is Radius of Gyration The lower the number is the earlier the ball will Rev up, the higher the number is the later the ball will rev up.

The Differential basically shows how much flare the ball will have, the higher the number is the more flare it will have and usually the more it will hook.

heres a nice basic explanation to read.
RG And Differential
Terms Used In Bowling Ball Specifications (http://bowlingballgalaxy.com/rg-differential.html)

[bowl1820]

I'll include this here also:

BOWLING BALL PARTS AND DYNAMICS (http://www.athletics2000.com/andrew/Documents/USBC%20Bowling%20Ball%20Parts%20and%20Dynamics.pdf )