Category Archives: Kinesiology
If you read our recent post about “How to Demo a Racquet,” you may be incentivized to do it!
So while you are at it try one of our performance racquets setup with MonoGut ZX or ZX Pro (thinner) to get the maximum performance from the racquet.
Ashaway MonoGut ZX and ZX Pro have been one of our most popular strings for well over five (5) years!
Top players have been using it, but now the word is spreading that is not just for “the good player” but for everyone! We are very sensitive to injuries and injury prevention, so that is why we recommend MonoGut ZX to almost all players. The durability and feel of this string are unique, and, MonoGut ZX and ZX Pro is a monofilament but is PEEK and no polyester.
As with any string, some will not want to change, but if you are looking for a new racquet, why not demo a racquet setup with MonoGut ZX or ZX Pro?
Ashaway MonoGut ZX and ZX Pro come in Black and Natural and 16 (1.27mm) and 17 (1.24mm) gauge.
Here is where it gets interesting! This racquet, the Gravity S, is a realtivley thin beam 104 square inch racquet!
It has been a while since Head has presented this head size in a player oriented racquet! This 296 gram (10.44 ounce) racquet fills a serious need, in my opinion, for a “players” 104! The 24mm beam allows the stiffness to reflect the new “Spiral Tech” fiber placement.
I believe this racquet will appeal to serious adults seeking a comfortable racquet (RDC 56 strung) that can elevate their game.
This racquet has plenty of “cutomization” potential which makes it great choice for quickly advancing players.
Stop by and feel this combination for yourself, and take the demo for a real test on the court!
|Racquet Model||Head Graphene 360 + Gravity S|
|Reference Tension||55 lbs - 24.9 kg|
|String||Head Velocity MLT Black|
|Machine Used||True Tension Professional|
|Racquet Flex, RDC||55 - After stringing|
|Racquet Flex, FlexFour||45|
|Racquet - In Plane Stiffness||304.6 lbs/Inch|
|Head Area, cm2||678.4|
|Head Area, Sq. Inch||105.2|
|Number of Main Strings||16|
|Number of Cross Strings||20|
|Main String Grid||7.25|
|Cross String Grid||9.87|
|Density (% of head filled with string)||.680|
|Average Cross String Space||.495|
|Average Main String Space||.453|
|Dynamic Tension, Kp, ERT||37|
|Dynamic Tension, Lbs/in||206.9|
|First Moment, Nm||.752|
|Swing Weight, Kg/cm2||292|
|Swing Weight, Ounces||10.30|
|Swing Weight Calculated||320.4|
|Head Weight, %||48.0%|
|Center of Percussion||20.9|
|Dwell Time, ms||8.50|
|Efective Stiffness - lbs||27.7|
If you read “Play Like a Girl,” you will have a good idea where this is headed! This part is intended to make it possible for you to experiment without feeling “forced” so it is based on “numbers” not “feelings.” Of course, feel is relevant to tennis players.
Two events this week make it easy to compare numbers and feeling.
- A racquet came in from a tournament playing junior that had the good fortune of picking up a competitors racquet and recognize the difference immediately and wanted to try it. His racquet is a Babolat Pure Strike 16×19 with a swing weight of 302! The racquet he picked up has a swing weight of 341! His revised swing weight is 325.
- A really good young lady is switching racquets and string setup, so there is a four (4) inch strip of 1/4″ tape on the inside of each side of the string bed in the 3 and nine o’clock position — total weight of about 5 grams, for a swing weight of 321. During a training session, a coach said the racquet was too heavy and removed about 2 inches total of tape, maybe 1.5 grams, and everything was fine! This player is strong enough to play with a 335 swing weight so was this a “visual” suggestion, and the process of removing tape convinced the payer that the racquet was now much lighter?
In case you don’t remember there are 28.35 grams per ounce. So you can see that 1.5 grams is quite small!
Did you know that a dry overgrip is about 5 grams and a wet over grip can be as much as 12 grams? The location of an overgrip (under your hand) has virtually no effect on swing weight so it generally goes unnoticed.
Unless agreed upon in advance most weight can be removed or re-located so don’t fear your friend…weight!
We were thrilled to have Dr. Brad Goodman visit the World Headquarters to produce a session for his Doc-Talk-Live program!
Dr. Goodman is a tennis player who wants to know more about equipment in an effort to protect his body and beat his opponents. You can catch this episode here: Doc Talk Live
In addition to the session Dr, Goodman was given the opportunity to “stretch” both a very stiff string and a very “stretchy” string, something that he, and many others, have not done. Needless to say he was amazed at the difference.
Dr, Goodman’s visit was a great opportunity to have a real conversation about tennis equipment. Please let me have your comments!
In our “Recommended Stringing Frequency” calculator we state that this frequency is to get the best possible performance from your racquet. But, what exactly is “best performance”?
To establish this we need to take you, the player, out of the picture for a moment and concentrate on the racquet and string setup. the reason is simple: no two players strike the ball the same way.
We start with “Swing Weight” which is the most important dynamic property of a racquet. So a higher swing weight will contribute to power and stability, thus performance.
Overall weight is important because you need to be able to get the racquet to the court and out of your bag! Heavier racquets contribute to energy, stability, and comfort.
Effective Stiffness is important because it represents the stiffness of the string bed (SBS) and the racquet stiffness (xxRA, or something like that). This number represents the impact each time you strike the ball. The higher the number, the stiffer, of course.
Of the four (4) things mentioned above we can control the string bed stiffness with ease. One of the easiest methods is to string your racquet regularly to maintain the effectiveness of the elongation of the string being used. Elongation relates to energy return in a string and while strings will stay resilient for a long time a well-worn string takes a while to return energy to the ball.
You, the player, of course, determine performance so when using the SFR you can enter a high UTR or Style rating or a low UTR or style rating if maximum performance is not required.