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Youth Bats:
Weight to Length Ratio: -4 to -13
Barrel Diameter: 2 1/4"
The weight to length ratio is simply the difference between the two. A 27" long bat the weighs 17oz. has a ratio of -10. The trick is to get the most bat your child can handle. Light weight increases swing speed and control, while a heavier bat can give a bit more pop. Think of driving a nail with a sledgehammer vs. a regular one. You get the idea. Remember, if your child can't control the bat, or swing with any authority, they are not going to have fun.
An excellent test for weight is to have your player hold the bat by its handle, then stretch his arms out so that his body makes a lopsided "t" shape (lopsided because the bat makes one arm much longer than the other). If he cannot hold the bat level with his shoulder for at least a count of ten, the bat is too heavy for him.
Length can be determined by use of a chart. Remember it's ok to buy one longer if they can control it. Just choke up for a while so your not buying a new bat every year. Unless it's from CMK Sporting Goods.

Senior League:
When: Just before High School
Barrel Diameter: 2 5/8 "
Length to Weight Ratio: -5 to -12
The -5 Senior League bat is an excellent option for hitters who are looking to play high school ball within the next year or two. Why, you ask? Most Senior League bats have between a minus 5 and a minus 12 length-to-weight ratio, while the required high school bat has a minus 3 length-to-weight ratio. It would be difficult for a pre-high school player to successfully transition when the weight difference is such. More often than not they can’t handle the weight change. They not only lose their swing speed, but their hitting mechanics suffer. So what can you do to avoid this catastrophe? It’s an easy solution. Transition to a -5 Senior League bat a year or two before your high school debut. Trust me, you’ll find that the -3 high school bat is much easier to swing. Be sure to check local regulations!!

Adult Baseball Bats: BESR vs. BBCOR vs. BESR-ABI
Weight to Length Ratio: -3
Ball Exit Speed Ratio (BESR) is the standard that formerly governed adult baseball bats. BESR is found by finding the ratio of ball exit speed to the combined speeds of pitched ball and swung bat.

The reason for the low ratio is simple. Aluminum bats can be made much lighter than wood. The increased swing speed is a danger to pitchers and fielders. The idea is to get the weight as close to wood as allowed, but retain the benefits of aluminum
Batted Ball Coefficient of Restitution (BBCOR) is the new standard that is currently governing adult baseball bats used in collegiate play, and will be implemented for high school play in 2012. Rather than measuring the ratio of the ball exit speed to pitch and bat speeds (like with BESR), BBCOR measures the trampoline effect of the baseball bat. In the past, when a pitched ball made contact with an alloy or composite baseball bat, the barrel would flex inward ever so slightly and the ball would retain some of its energy resulting in farther hits. Wood baseball bats don't have as much "give" to them and the ball loses much of its energy upon impact. The BBCOR standard ensures that non-wood bats perform more comparably to wood bats in an attempt to level the playing field.


The BESR-ABI certification applies to BESR baseball bats that passed the Accelerated Break-In (ABI) test. The ABI test is meant to demonstrate how a composite baseball bat will perform over the course of its potential useful life in the baseball field. The goal here is to make sure that when a composite baseball bat is fully broken-in, that it is not exceeding BESR standards. Baseball bats that pass the ABI test are legal for high school play across the country until the end of 2011.

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