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BBGM is an acronym in golf that stands for Bottom of Bore to Ground Measurement. It is the distance from the bottom of the hosel bore to the point where the shaft meets the ground when the club is in the address position. The BBGM is used in MOI planning and matching calculations and can be calculated by subtracting the hosel depth from the hosel length. This measurement is important because it affects the final flex of the shaft/club and can vary depending on the type of club head and shaft adapter sleeve used.
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BBGM is an acronym for Bottom of Bore to Ground Measurement
In golf, BBGM is an acronym for Bottom of Bore to Ground Measurement. It refers to the distance from the bottom of the hosel bore to the point where the shaft meets the ground when the club is in the address position. Essentially, it is how far the shaft tip rests above the ground when fully inserted into the hosel.
The calculation of BBGM is straightforward. First, measure the raw length of the shaft. Then, insert it into the hosel, ensuring it reaches the bottom of the bore, and measure the total club length. Finally, subtract the raw shaft length from the total club length with the shaft installed, and the result is the BBGM. For example, if the raw shaft length is 46", and the total club length with the shaft inserted is 47.5", the BBGM is 1.5" (47.5" - 46" = 1.5").
The BBGM value is crucial in golf club design and performance. It affects the final flex of the shaft and club. For instance, a 1" difference in BBGM between a standard metal wood (M1) and a blind bore head results in a noticeable stiffness in the blind bore club, similar to tip trimming the shaft by an extra 1".
Furthermore, BBGM plays a role in MOI planning and matching calculations. While there is no industry uniformity in BBGM values among woods, hybrids, irons, and wedges, some standards exist. In most irons, a BBGM of 1" is standard, while blade-style wedges may have a BBGM of 1.5" or higher. Offset drivers or those with interchangeable adapter systems can have a BBGM as high as 2".
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It is the distance from the bottom of the hosel bore to the ground
BBGM stands for Bottom of Bore to Ground Measurement in golf. It refers specifically to the distance from the bottom of the hosel bore to the point where the shaft would meet the ground when the club is in the address position. In other words, it is the measurement of the hosel to floor depth.
The hosel bore is the hollow for the shaft in the hosel part of a golf club head. The depth of the hosel bore, or the hosel depth, is measured from the hosel top to the bottom of the hosel bore. The diameter of the hosel bore is referred to as the hosel inside diameter or hosel bore diameter, and it is expressed in thousandths of an inch.
The BBGM measurement is calculated by subtracting the hosel depth from the hosel length. This measurement is used in MOI planning and matching calculations. It is an important consideration when choosing a golf club as it can impact the overall length of the club and the angle of the shaft in relation to the ground.
The hosel depth can vary depending on the manufacturer and the design of the club head. Some club heads have a hosel depth of 1.25", while others have a bore-thru design where the shaft goes all the way to the ground. The BBGM measurement helps to determine the playing length of the club and can influence the distance achieved with each shot.
By understanding the concept of BBGM and how it relates to the hosel bore depth, golfers can make more informed decisions about their equipment and find the optimal club specifications for their game.
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BBGM is calculated by subtracting hosel depth from hosel length
In golf, BBGM stands for Bottom of Bore to Ground line Measurement. It is the distance from the bottom of the hosel bore to the point where the shaft would meet the ground when the club is in the address position.
The BBGM measurement is used in MOI planning and matching calculations. It helps to ensure the club is the correct length for the player, taking into account their height, arm length, and posture. A correct BBGM measurement can help a player achieve the optimal ball striking position and improve their swing and overall performance.
The BBGM can be calculated by subtracting the hosel depth from the hosel length. The hosel is the section of the club that connects the clubhead to the shaft. The hosel depth refers to the measurement from the bottom of the hosel bore to the tip of the hosel, where the shaft is inserted. The hosel length refers to the measurement from the bottom of the hosel bore to the end of the hosel, where the clubhead is attached.
By subtracting the hosel depth from the hosel length, you are essentially finding the distance from the bottom of the hosel bore to the ground. This calculation takes into account the angle of the hosel and the length of the shaft to determine the correct height of the club when addressed to the ball.
It is important to note that the BBGM measurement is just one aspect of club fitting and should be considered along with other factors such as lie angle, loft, and grip size to ensure the club is properly fitted to the player's unique specifications.
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BBGM is used in MOI planning and calculations
BBGM, or Bottom of Bore to Ground line Measurement, is a crucial concept in golf club design and customisation. It refers to the distance from the bottom of the hosel bore to the point where the shaft meets the ground when the club is in the address position. This measurement is essential in Moment of Inertia (MOI) planning and calculations.
MOI is a fundamental aspect of golf club design, as it determines the club's resistance to twisting during the golf swing. A higher MOI indicates greater resistance to twisting, which can lead to more forgiving and consistent shots. By customising the BBGM, golfers can influence the MOI of their clubs to better suit their swing characteristics and improve performance.
The BBGM value is used in MOI calculations to determine the optimal weight distribution within the golf club. It helps determine the centre of gravity (CG) position, particularly in the vertical direction, affecting launch angle and spin rates. A higher BBGM can lead to a higher CG, resulting in lower spin rates and a more penetrating ball flight. Conversely, a lower BBGM can produce a lower CG, increasing spin rates and promoting higher launch angles.
Golf club manufacturers and fitters utilise BBGM in MOI planning to offer golfers customised equipment tailored to their swing characteristics and performance goals. Adjustments to BBGM can be made by altering the hosel length or depth. However, it is important to note that BBGM is just one factor in MOI calculations, and other factors, such as shaft weight distribution, CG in the clubhead, and lie angle, also play a significant role in determining the club's MOI.
While BBGM is a critical factor in MOI planning and calculations, it is just one aspect of golf club design. Other factors, such as shaft flex, clubhead design, and grip size, also influence a golfer's performance and must be considered in combination with MOI optimisation to create a holistic club-fitting experience.
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Bore type affects the final flex of the shaft/club
The flex in a golf shaft is crucial to a player's performance, affecting the distance, accuracy, and trajectory of the shot. The shaft flexes during the swing, changing the position of the clubhead, so selecting the right flex ensures that the clubface will be square on the ball when it makes contact. The flex in a golf shaft also determines the amount of bend in the shaft during the swing and at impact.
Bore type directly affects the final flex of the shaft/club. The BBGM (Bottom of Bore to Ground line Measurement) of a standard metal wood (M1) versus a blind bore head is 1". Inserting the same shaft into two heads with different bore types will result in a stiffer blind bore club, similar to tip-trimming the shaft an additional 1". Metal woods, which became popular in the late 1970s, required tip-trimmed shafts to achieve the desired flex.
Manufacturers have introduced various bore types, such as M1 and M2 metal woods, each requiring different amounts of tip trimming. These variations in bore type and trimming methods influence the final flex of the shaft/club. Today, there is a lack of industry uniformity in BBGM among woods, hybrids, irons, and wedges, leading to slight differences in feel when using the same shaft in different club heads.
The flexibility of the golf shaft impacts the launch height, spin, and overall feel of the club. Golfers with high swing speeds require stiffer shafts to prevent the club head from lagging behind, causing inconsistent shot shapes. Conversely, golfers with slower swing speeds using stiff shafts may struggle to close the clubface at impact, resulting in a slice.
Selecting the proper flex for one's swing is essential. Playing the wrong golf shaft flex can lead to the development of bad habits that become challenging to fix. Choosing the right flex, on the other hand, can offer significant benefits such as increased distance, straighter shots, and improved carry.
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