Category Archives: Evaluation
A Long Head Gravity Tour 98
As a high performance racquet technologies business, we have requests for everything imaginable, some not so imaginable! Long racquets are at the top of the list.
Full Custom Head Gravity Tour 98!
Here is a review of a Head Gravity Tour 98 2025 SMU that is 27.75 inches long/70.485cm. See if you can determine which property is most affected by the length.
You can see the string properties here as data taken on our Questron.
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Gravity Tour 98 2025 SMU |
| Reference Tension | 57 |
| String | MonoGut ZX Pro |
| Machine Used | True Tension Pro |
| String Bed Stiffness - RDC | 52 |
| String Bed Stiffness -FlexFour | 61.0 |
| Strig Bed Stiffness - SBS | 50.6 |
| String Bed Stiffness - ERT | 37 |
| Racquet Flex, RDC | 58 |
| Racquet Flex, FlexFour | 43 |
| Racquet - In Plane Stiffness | 429.5 |
| Weight, Grams | 335 |
| Weight, Ounces | 11.82 |
| Balance, mm | 331 |
| Balance, Inch | 13.03 |
| Length, Cm | 70.5 |
| Length, Inch | 27.756 |
| Head Width | 9.86 |
| Head Length | 12.71 |
| Head Area, cm2 | 633.6 |
| Head Area, Sq. Inch | 98.2 |
| Beam Height @ Grip, mm | 21.3 |
| Beam Height @ Mid, mm | 21 |
| Beam Height @ Tip | 21.5 |
| Beam Width @ Grip, mm | 10.5 |
| Beam Width @ Throat, mm | 10.6 |
| Beam Width @ Mid, mm | 10.8 |
| Beam Width @ Tip, mm | 12.2 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 19 |
| Ratio | .650 |
| Main String Grid Inch/mm | 7.72/196.1 |
| Cross String Grid Inch/mm | 10.25/260.4 |
| Density (% of head filled with string) | .785 |
| Average Cross String Space | .546 |
| Average Main String Space | .464 |
| Dynamic Tension, Kp, ERT | 37 |
| Dynamic Tension, Lbs/in | 206.94 |
| First Moment, Nm | .858 |
| Polar Moment | 362 |
| Torsional Stability | 18 |
| Swing Weight, Kg/cm2 | 344 |
| Swing Weight, Ounces | 12.13 |
| Swing Weight Calculated | 367.0 |
| Power, RDC | 49 |
| Control, RDC | 52 |
| Manueverability, RDC | 57 |
| Power, Calculated | 2096.5 |
| Head Points | 6.77 |
| Head Weight, % | 47% |
| Center of Percussion | 21.44 |
| Dwell Time, ms | 6.492 |
| Efective Stiffness - lbs | 27.42 |
| K, Lb/In | 166.67 |
| Recoil Weight | 167.7 |
| Twist Weight | 242.8 |
| End Weight | 131.6 |
| Tip Weight | 202./6 |
| 9 O'Clock | 94.7 |
| 3 O'Clock | 94.9 |
| Butt End | 144.5 |
| COF, Main | .339 |
| COF, Cross | .300 |
A Hybrid View…Part 2
This post is an adjunct to the previous post that did not use polyester as a component. This one does.
This string data is very important to us, and we believe players. Please let us know what other properties you think are important, and we will try to include them in future posts.
Three Important Things
When dealing with tennis racquets, there are many significant performance parameters. We are going to list our three (3) most important ones:
- Swing Weight
- Overall Weight
- Effective Stiffness
These particular parameters are based on machine testing, physics, and experience.
- Swing Weight: we refer to this as a dynamic weight, meaning how heavy or light the racquet feels during the swing to the ball.
- Overall Weight: This is normally considered to be the weight found on a scale, electronic, or balance. Weight is your friend if properly associated with your capabilities and stature.
- Effective Stiffness: is a calculable and measurable stiffness of the ball hitting the string as you are holding the racquet and hitting a ball.
Why is it Important?:
- Swing Weight: contributes to power and stability, which contributes to control. A higher swing weight of, say, 320 to 340 will handle most incoming balls with ease. Swing weights of 300 to 319 will be easier to maneuver and require a little more energy from the player to handle aggressive incoming balls.
- Overall Weight: contributes to ease of movement and long play time and must be associated with the stature and style of the player. The heavier racquet will provide more power with less energy expended by the player.
- Effective Stiffness: this is a metric we use to ensure the racquet is within the stiffness range needed by the player. For example, if you come into the World Headquarters of Racquet Quest for the first time with your current racquet and the strings are intact, we can determine the effective stiffness and, based on your satisfaction with the current playability, arrive at a corresponding effective stiffness…not on a reference tension. A range of 24 to 30 pounds is acceptable. Anything over 30 becomes quite stiff and should be avoided by most players.
If you look at our racquet reviews, you will see a lot more than three (3) performance parameters! We believe they are all important, but players should understand the three (3) described here.
Racquet Quest, LLC
