How many times have bats been changed since the 90's?

I think twice. 99 and 2010 maybe? The first change was just a circumference decrease if I'm not mistaken.

1986 - weight limit. Concern about the increase in bat performance and the impact that metal bats were having on the game of baseball, the NCAA imposed a lower limit on the weight of a bat. This wasn't technically a performance standard (batted-ball speeds were neither measured nor regulated) but the fact that hollow aluminum bats can be made significantly lighter in weight than solid wood bats allows for a greater bat-swing speed and better bat control. The NCAA restriction on bat weight did cause bat performance to drop for the next several years.

1999 - BESR standard. During the early 1990's several governing bodies and manufacturers had been discussing the regulation of bat performance. After the 1998 season - during which a large number of scoring records were broken - the issue came to a head, and the NCAA adopted the BESR (Ball-Exit-Speed Ratio) standard to regulate the performance of aluminum and composite bats. In addition, the NCAA instituted a reduction of the maximum barrel diameter to 2.5-inches, the "minus-3" rule on weight -- which means that the difference between the weight of the bat (in ounces) and the length (in inches) can be nor no more than 3 integers -- and a lower limit on the bat's moment-of-inertia.

2009 - composite bat ban. During the 2009 College World Series the NCAA discovered that a large percentage of BESR approved composite bats were found to significantly exceed the performance standard after being broken in through use. In July 2009, the NCAA imposed an indefinite moratorium banning the use of composite bats.

2011 - BBCOR standard. After extensive laboratory testing of a large number wood, metal and composite bats, and based on the scientific evidence and arguments of several researchers including Dr. Alan Nathan and myself, the NCAA abandoned the BESR standard and replaced it with the BBCOR=0.50 standard. This new BBCOR standard effectively requires non-wood bats (metal and composite) to produce batted ball speeds no greater than wood.

LINK

Well I was off

quote:

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1986 - weight limit. Concern about the increase in bat performance and the impact that metal bats were having on the game of baseball, the NCAA imposed a lower limit on the weight of a bat. This wasn't technically a performance standard (batted-ball speeds were neither measured nor regulated) but the fact that hollow aluminum bats can be made significantly lighter in weight than solid wood bats allows for a greater bat-swing speed and better bat control. The NCAA restriction on bat weight did cause bat performance to drop for the next several years.

1999 - BESR standard. During the early 1990's several governing bodies and manufacturers had been discussing the regulation of bat performance. After the 1998 season - during which a large number of scoring records were broken - the issue came to a head, and the NCAA adopted the BESR (Ball-Exit-Speed Ratio) standard to regulate the performance of aluminum and composite bats. In addition, the NCAA instituted a reduction of the maximum barrel diameter to 2.5-inches, the "minus-3" rule on weight -- which means that the difference between the weight of the bat (in ounces) and the length (in inches) can be nor no more than 3 integers -- and a lower limit on the bat's moment-of-inertia.

2009 - composite bat ban. During the 2009 College World Series the NCAA discovered that a large percentage of BESR approved composite bats were found to significantly exceed the performance standard after being broken in through use. In July 2009, the NCAA imposed an indefinite moratorium banning the use of composite bats.

2011 - BBCOR standard. After extensive laboratory testing of a large number wood, metal and composite bats, and based on the scientific evidence and arguments of several researchers including Dr. Alan Nathan and myself, the NCAA abandoned the BESR standard and replaced it with the BBCOR=0.50 standard. This new BBCOR standard effectively requires non-wood bats (metal and composite) to produce batted ball speeds no greater than wood.

LINK

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Thank you. I knew the 99 change ended all out gorilla ball, I wasn't aware of the composite ban in 2009, but it seems the 2011 change really killed the ball.

I thought the BESR was a happy medium between all out gorilla ball and all out small ball.