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What Are BESR Bats?

Now, junior batsmen are making similar changes to the American batting standard. The new young bats approved for the new USA Bat Standard were released in September 2017, and the new rule went into effect on January 1, 2018.

As of January 1, 2012, all baseball bats at the high school and college levels were required to meet the BBCOR standard.  This was the new batting standard for checking bats and was created for a number of reasons, but mainly for safety and for bats like the Easton Stealth. BBCOR effectively replaced BESR certification. takes a look at what is it and what it entails. giving the need.


The NCAA requires all non-wooden bats to be certified as “live”.
The certification process is done by measuring performance in relays
checking conditions and then assigning a number; This number is known
BESR (Ball Exit Rate Ratio). To qualify, the cost must be at or below
Agreement as determined by the NCAA. This paper focuses on the concept of the bat.

What was the BESR Certification?

The bat exit velocity ratio was the first hitting parameter to control adult baseball bats. After the NFHS and NCAA banned adult barrel baseball bats in 2010 bat manufacturers were allowed to apply for exemptions for certain baseball bats. To qualify for this exemption, his baseball bat had to undergo a Rapid Penetration Test (ABI). The system tested composite baseball bats after breaking them to make sure they weren’t too hot to play. Turtles that received an exemption in 2011 may be used in high school sports across the country (including California).

Therefore, they did not control the speed of the racquetball. Instead, it was required that the ball exit velocity ratio of the nonwood rod be equal to or less than the value of the standard wood rod of the same length.

What are the highlights of the BESR bat rule?

Every adult baseball bat after 2011 and before 2023 must be:

The length of the thickest part (wood) is 2 3/4″ or less

Length at longest part: (non-wood) 2 5/8″ or less

Length: 36 inches or less

By Weight: The quail, athletically speaking, should not weigh more than three ounces under the weight of the quail (e.g., a 33-inch paddle cannot be less than 30 ounces)

BSER in Comparison

In comparison, standard BESR bats were more forgiving. Hitting the ball with the tip of the club often leads to kicks and single kicks. BBCOR bat materials require the ball to be square to make serious contact. Composite bats have been seriously intimidating as the limits of bat materials have grown over the years.

With the new formula, factors would produce a crazy trampoline effect. A 400-foot home run with a BESR bat will result in a 375-foot flight using a BBCOR bat.


It is calculated the taking the ratio of the exit velocity.bat to the velocity of a ball bounced against a brick wall. USSSA Allows ball/stick bounce to be up to 15% faster than ball/brick wall bounce. Offer with a rating of 1.15 BPF. Or to put it another way, a stationary BPF 1.15 bat will not bounce a ball more than 15% faster than a ball bouncing off a brick wall (at the same speed).

In practice, they don’t throw baseballs against a brick wall. They already know this number. Instead, they should measure the exit velocity of a stationary bat that a baseball has hit. Like BBCOR, BPF 1.15 bats are processed prior to inspection.

The Dependence of Swing Speed on Moment-of-Inertia for Baseball Bats

In 2000, it became clear that normal BESR alone could not explain changes in bat speed in the field. Therefore, the NCAA decided to regulate the weight and moment of inertia (MOI) of a non-wooden bat. This decision is based on field tests that show a direct relationship between the swing speed of the baseball bat and the moment of inertia of the bat. Three field studies specifically focused on the relationship between bat velocity and moment of inertia in adult baseball players [5-7], and all three studies concluded that bat velocity had a lower moment of inertia. – for larger and smaller inertial bats. For bats with high moment of inertia.

Alan Nathan analyzed bat swing velocity data from Flessig[5] and Crisco-Greenwald[7] field studies and applied the data to formulas to calculate bat velocity. The graph on the right shows the data and the fit to the Crisco-Greenwald data along with the resulting equation relating the angular velocity of the racket from the pivot to the moment of inertia from the knob (eKnob).

For Fleisig’s farm, Nathan adapts to the data

There are a few things we need to do with any of these equations before we can get the bat velocity necessary value to predict the BBS. First, we need to convert the angular velocity of the collision point into linear motion. Taking a sweet spot 6 inches from the end of the bat barrel (or 28 inches from the club), we can multiply the angular velocity by 28 inches to get the linear velocity of the sweet spot. The result gives besr bat velocity at the point of impact in inches per second. Multiplying this value by 0.05682 gives the swing speed of the bat in miles per hour.

A more complicated change to our needs with the Iknob value. Club inertia is measured at the pivot point of the shaft at 6 inches of the club. However, the swing velocity equations use the moment of inertia relative to the pivot point of the club. If you know the weight of the club, and the balance point (the location of the center of gravity). you can use the parallel axis theorem to calculate the MIA of the club at 6 inches. For bats used in the Crisco-Greenwald batting cage test, conversion is approximately Iknob = 1.493*MOI6 + 1610 oz-in2 units.

For example, a typical 34″ wooden club has a moment of inertia of 11,500 oz-in2 measured. Approximately from the pivot point at the 6″ point on the shaft. The linear besr bat motion of the sweet spot is calculated as follows: Crisco-Greenwald bat = 68.6 mph and Fleisig bat = 59.3 mph.

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