Category Archives: Technology
Head Gravity MP L 2025
Wow! The new Head Gravity 2025 series keeps getting better! This is the new Head Gravity MP L and it hits the mark on many properties!
Head Gravity MP L 2025
The “MP” indicates it has a mid-plus head size of 100 square inches. The “L” means it is lighter than the “MP,” but everything else is the same head size and string pattern.
Why do we believe this is such a good racquet?
- Easy to customize as the player progresses
- Very good 16×20 string pattern spacing that creates a good, effective stiffness
- Terrific RDC flex of 59, making it perfect for precision and comfort
- The modified “cap” grommet system protects the string and racquet from “ball to foot” pick-up. This is important!
The table shows all of the properties, but it does not include the very important graphics!
If you are an aspiring junior or adult player, this is a racquet you must try.
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Gravity MP L 2025 |
| Reference Tension | 55 |
| String | PEEK 7710 |
| Machine Used | True Tension Pro |
| String Bed Stiffness - RDC | 49 |
| String Bed Stiffness -FlexFour | 55.9 |
| Strig Bed Stiffness - SBS | 45.8 |
| String Bed Stiffness - ERT | 34 |
| Racquet Flex, RDC | 59 |
| Racquet Flex, FlexFour | 47 |
| Racquet - In Plane Stiffness | 446.8 |
| Weight, Grams | 307 |
| Weight, Ounces | 10.83 |
| Balance, mm | 343.0 |
| Balance, Inch | 13.50 |
| Length, Cm | 68.6 |
| Length, Inch | 27.008 |
| Head Width | 9.93 |
| Head Length | 12.86 |
| Head Area, cm2 | 646.5 |
| Head Area, Sq. Inch | 100.2 |
| Beam Height @ Grip, mm | 21.0 |
| Beam Height @ Mid, mm | 22.3 |
| Beam Height @ Tip | 22.8 |
| 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 | 20 |
| Ratio | .616 |
| Main String Grid Inch/mm | 7.65/194.3 |
| Cross String Grid Inch/mm | 10.25/260.4 |
| Density (% of head filled with string) | .764 |
| Average Cross String Space | .516 |
| Average Main String Space | .464 |
| Dynamic Tension, Kp, ERT | 34 |
| Dynamic Tension, Lbs/in | 190.16 |
| First Moment, Nm | .822 |
| Polar Moment | 332 |
| Torsional Stability | 18 |
| Swing Weight, Kg/cm2 | 314 |
| Swing Weight, Ounces | 11.08 |
| Swing Weight Calculated | 361.2 |
| Power, RDC | 45 |
| Control, RDC | 55 |
| Manueverability, RDC | 77 |
| Power, Calculated | 1856.4 |
| Head Points | -.16 |
| Head Weight, % | 50.1% |
| Center of Percussion | 20.5 |
| Dwell Time, ms | 6.69 |
| Efective Stiffness - lbs | 26.8 |
| K, Lb/In | 157.1 |
| Recoil Weight | 135.1 |
| Twist Weight | 225.7 |
| End Weight | 109.6 |
| Tip Weight | 196.3 |
| 9 O'Clock | 95.0 |
| 3 O'Clock | 88.7 |
| Butt End | 122.2 |
| COF, Main | .380 |
| COF, Cross | .342 |
Head Gravity Tour 98 Retail Version
We reviewed the “Pre-Release” model a few weeks ago, so here is the retail version review!
Much of the data is the same, so if you have hit the Pre-Release version, you should not expect significant changes—except for one big one: the graphics! Some hitters have proclaimed this the “best-looking racquet of all time!”
Head Gravity Tour 98 2025 Retail
Of course, “beauty is in the eye of the beholder,” so we will leave that up to you. Recreating the look realistically with a picture is impossible, so you need to see it in person!
Besides looking great, this racquet offers some welcome performance features:
- Flex
- Swing Weight
- Head Size
- String Pattern
- Grommet System
The following table lists most of the features. One essential feature is the grommet system, a “cap” system that helps protect the string from court damage caused by “ball to foot” pickup! If you can’t stop doing that, you need this protection!
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Gravity Tour 98 Retail |
| Reference Tension | 54 |
| String | PEEK 7710 |
| Machine Used | True Tension Pro |
| String Bed Stiffness - RDC | 46 |
| String Bed Stiffness -FlexFour | 55.5 |
| Strig Bed Stiffness - SBS | 45 |
| String Bed Stiffness - ERT | 33 Kg/Cm |
| Racquet Flex, RDC | 58 |
| Racquet Flex, FlexFour | 45 |
| Racquet - In Plane Stiffness | 402.6 |
| Weight, Grams | 331.2 |
| Weight, Ounces | 11.68 |
| Balance, mm | 327 |
| Balance, Inch | 12.87 |
| Length, Cm | 68.6 |
| Length, Inch | 27.008 |
| Head Width | 9.827 |
| Head Length | 12.724 |
| Head Area, cm2 | 633.6 |
| Head Area, Sq. Inch | 98.2 |
| Beam Height @ Grip, mm | 21.0 |
| Beam Height @ Mid, mm | 22.0 |
| Beam Height @ Tip | 22.0 |
| Beam Width @ Grip, mm | 10.7 |
| Beam Width @ Throat, mm | 11.3 |
| Beam Width @ Mid, mm | 10.5 |
| Beam Width @ Tip, mm | 12.1 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 19 |
| Ratio | .650 |
| Main String Grid Inch/mm | 7.50/190.5mm |
| Cross String Grid Inch/mm | 10.38/263.6 |
| Density (% of head filled with string) | .774 |
| Average Cross String Space | .543 |
| Average Main String Space | .455 |
| Dynamic Tension, Kp, ERT | 33 |
| Dynamic Tension, Lbs/in | 184.57 |
| First Moment, Nm | .835 |
| Polar Moment | 340 |
| Torsional Stability | 15 |
| Swing Weight, Kg/cm2 | 325 |
| Swing Weight, Ounces | 11.46 |
| Swing Weight Calculated | 353.9 |
| Power, RDC | 47 |
| Control, RDC | 52 |
| Manueverability, RDC | 70 |
| Power, Calculated | 1868.8 |
| Head Points | 5.04 |
| Head Weight, % | 47.7% |
| Center of Percussion | 21.0 |
| Dwell Time, ms | 6.90 |
| Efective Stiffness - lbs | 25.7 |
| K, Lb/In | 164.57 |
| Recoil Weight | 156.83 |
| Twist Weight | 238.77 |
| End Weight | 132.6 |
| Tip Weight | 190.0 |
| 9 O'Clock | 94.6 |
| 3 O'Clock | 93.4 |
| Butt End | 143.1 |
| COF, Main | .366 |
| COF, Cross | .346 |
Yes, this is perfect!
Yes, you read that correctly! What you are about to see will make your eyes water with anxiety, but that’s OK!
Perfect!
Most players would have surrendered this racquet weeks ago, but this player was determined to use the string to its maximum capability.
We agree!
The racquet was performing properly, and there was another one or two in the bag, so why not?
The string is a thin multi-filament so the “fraying” is typical and not to be feared!
The strike zone is very close to the center of percussion, with a couple of hits a little higher up, but generally, the zone is perfect!
So, before you panic and relegate your racquet to the bag, remember this picture!
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
