THIS.
There have been multiple studies on the differences between ball weights (14#, 15#, and 16#) and numerous discussions in the bowling world. With revs and angles becoming more crucial to bowling high scores...bowlers have dropped down into the 15# area. I also think many bowlers look at 16lb balls as "old-fashioned". For a short time there was a push to go to 14lb balls...but that kinda died off.
I still think you throw the most weight you can adequately control. I still think 16lb will carry more than 15lb. BUT...I think you can get a slightly higher rev rate as you move down the ladder...and that increased rev rate may allow you to maximize your angle...thus you could score higher with a 15lb ball despite the lesser carry.
I started out throwing my Grandpa's old 14lb urethane ball. He transitioned from 15lbs to 14lbs in his old age due to arthritis. That was a common reason to go down in weights and still is. When I bought my first ball, I went with 15lbs. But, since I wasn't having trouble controlling the 15lber AND I could find really good bargains ($$$) on balls that were 16lbs on clearance...I decided to switch to 16lbs. I plan to try 15lbs again later this year when I switch arsenals. I DO think I had more revs on the ball throwing 15lbs. Will I swear by 15#? Maybe...maybe not.
But would I throw multiple different weights in one arsenal? No. It's hard enough dealing with the differences in span, drilling, thumb fit, etc... I have 4 of my 6 balls drilled tri-grip. The other two are drilled conventionally. One of the balls has the VISE IT system/slugs....the others do not. Some have only a few pieces of tape in the thumb hole and that feels fine...others have 7-9 pieces of tape in them. Two have lifter style finger inserts...the other 4 have ovals. With all that variation already existing...I wouldn't want to add varying weights to the equation. I used to throw 15lb and 16lb...and switching from weight to the other...I'd say it took at LEAST 2 frames to get where it felt comfortable.
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