Category Archives: Demo

Bolt 100 v2

Bolt tennis racquets have been around for a few years and we have reported on them in the past, however, the new V2 of the Bolt racquet lineup is very impressive!

If you are not at all familiar with the Bolt technology it is the “Zip Strip” that makes them unique.  The “Zip Strip” is a carbon fiber component that looks like a miniature tennis racquet cross-section that fits into the sides and top that actually do the “bending” during string and racquet impact!

This “bending” can mitigate harshness associated with very stiff strings or a very stiff racquet!

Arm problems are no match for the ZipStrips!

Before we look at the specifications you can visit the Bolt site for more information.

Bolt 98L, V2 
ManufacturerBolt
Racquet ModelBolt 100, v2
Reference Tension57 lbs - 25.9 k
String: Main/Cross
Head Reflex
Machine UsedTrue Tension Pro
Static
ASPS, RDC56
ASPS, FlexFour64.5
Racquet Flex, RDC64 - After stringing
Racquet Flex, FlexFour46
Weight, Grams313
Weight, Ounces11.06
Balance, mm337
Balance, Inch13.27
Length, Cm68.5
Length, Inch26.98
Head Width9.589
Head Length13.13
Head Area, cm2665.1
Head Area, Sq. Inch103.1
Beam Width, mm, Shaft, Center, Tip24.5, 24.5, 23.8
In Plane Stiffness, Pounds/In454 Lbs/In.
In Plane Stiffness, Kg/cm178.7 Kg/cm
Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.642
Main String Grid7.37
Cross String Grid9.62
Density (% of head filled with string).688
Average Cross String Space.506
Average Main String Space.461
Dynamic
Dynamic Tension, Kp, ERT36
Dynamic Tension, Lbs/in201.35
First Moment, Nm.822
Polar Moment350
Torsional Stability19
Swing Weight, Kg/cm2331
Swing Weight, Ounces11.68
Swing Weight Calculated356.6
Power, RDC48
Control, RDC53
Manueverability, RDC66
Power, Calculated 2183.7
Head Points1.42 (negative = head heavy)
Head Weight, %49.3%
Center of Percussion21.4
Dwell Time, ms, No Swing8.50
Effective Stiffness - lbs29.9
K, Lb/In (SBS) RDC179.49
Recoil Weight157.0
Twist Weight234.11
End Weight118.7
Tip Weight196.1
Total Weight314.8
9 O'Clock103.0
3 O'Clock98.9
Butt Cap110.3
Total Weight312.2

 

 

 

Head Graphene 360+ Radical S v21

From our perspective the Radical S should be one of the most used of the Radical Series!

Head Graphene 360+ Radical S

Why?  The 102 square inch head size is optimum for players looking for additional power,( and who isn’t) in a legitimate players racquet.  We say “legitimate” because this racquet can be turned into any thing you want, now or in the future!

As you will see in the specifications this is not a really stiff racquet so it will be easy for many players to customize the string bed to suit current playing style with an eye toward becoming a more aggressive player, or not!

The Radical S continues with the “control pattern” and “sound grommets”.  We are not totally certain what the “sound grommets” do but sound is frequency and frequency can be felt so maybe the grommets are damping out some of the higher frequencies?

Anyway, this Radical S model is a great step into the “performance” racquet arena with plenty of room to grow!

 

Head Graphene 360+ Radical S v21
ManufacturerHead
Racquet ModelHead Graphene 360+ Radical S v21
Reference Tension55 lbs - 24.9 k
String: Main/Cross
Victrex 7718
Machine UsedTT Professional
Static
ASPS, RDC55
ASPS, FlexFour61.5
Racquet Flex, RDC61 - After stringing
Racquet Flex, FlexFour50
Weight, Grams296
Weight, Ounces10.44
Balance, mm333
Balance, Inch13.11
Length, Cm68.5
Length, Inch26.968
Head Width9.860
Head Length13.09
Head Area, cm2653.9
Head Area, Sq. Inch101.3
Beam Width, mm, Shaft, Center, Tip22, 25, 23
In Plane Stiffness, Pounds/In370.4 Lbs/In
In Plane Stiffness, Kg/cm66.2 Kg/cm





Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.634
Main String Grid7.30
Cross String Grid9.75
Density (% of head filled with string).703
Average Cross String Space.513
Average Main String Space.449
Dynamic
Dynamic Tension, Kp, ERT35
Dynamic Tension, Lbs/in195.8
First Moment, Nm.764
Polar Moment320
Torsional Stability17
Swing Weight, Kg/cm2303
Swing Weight, Ounces10.69
Swing Weight Calculated328
Power, RDC42
Control, RDC60
Manueverability, RDC85
Power, Calculated 1873.1
Head Points2.99 (negative = head heavy)
Head Weight, %48.6%
Center of Percussion21.2
Dwell Time, ms, No Swing8.58
Effective Stiffness - lbs28.9
K, Lb/In (SBS) RDC176.28
Recoil Weight144.50
Twist Weight214.65
End Weight113.1
Tip Weight183.4
Total Weight296.5
9 O'Clock92.1
3 O'Clock91.8
Butt Cap112.2
Total Weight296.1

Head Graphene 360+ Radical Series Comparative Data

For 2021 there are Three (3) Radical Models!

Click Here to See Radical Series Comparison Data

Radical MP v21

A Close Look at Orange

The new, for 2021, Head Graphene 360+ Radical series is a radical step into colors that have always been the “mark” of the Radical Series but now it has gone even further into radicalism!

We think that is a good thing!  Why mess around with just a little orange when you can go all out!

It is impossible to see the vibrancy of this orange without holding it in your hand!  We invite to to hold one in your hand and even hit with it!

The Radical MP has been the most popular model over the years.  This model has all the attributes of the Pro without the added weight, (which can be added later if needed)!

The thin beam carries over to the MP and Pro while the S has a slightly wider beam.

The S model fits the very necessary range of 102 square inch racquets because Head has, correctly, reduced the number of head sizes per model.  The Speed series has the 100 square inch head size very well covered.

You will see all the specifications on each individual review that will be posted shortly.

 

 

 

Head Graphene 360+ Radical Pro

Head Graphene 360+ Radical S

Head Graphene 360+ Radical Pro v21

As you would expect the Radical Pro is the heaviest of the Radical Series, but only by a few grams!  What!  When we talk about grams to some players it might as well be angstroms or something like that.  What the heck is a gram?  For many in the US market is still “Talk to me in ounces, please!”

OK, there are 454 grams in a pound and 16 ounces in a pound.  If I said a racquet weighs 285 grams what would you think?  Or, if I said the racquet weighs 10 ounces which sounds better if you are weight averse?

A cup of coffee weighs over 500 grams!

OK, the Radical Pro weighs 13 grams more than the Radical MP so how many ounces is that?

Enough of this stuff!  However, it is important to know what weight is and how it can be a significant factor in your playing.  Weight is your friend!

As you will see in the following specifications a lot depends on how the weight is distributed throughout the racquet.

Head Graphene 360+ Radical Pro

Here is a little hint; take a look at the swing weight of the MP and the Pro and tell me what you see.

The Radical Pro has the “sound grommets’ and the “control pattern” for those concerned with string spacing, and that should be many of you.  String spacing can have a profound affect on durability and playability.

The enlarged circle was intended to show the elongated grommets which allow the string to move and effectively be a little longer meaning more energy return.

Head Graphene 360+ Radical Pro v21
ManufacturerHead
Racquet ModelHead Graphene 360+ Radical Pro v21
Reference Tension55 lbs - 24.9 k
String: Main/Cross
Victrex 7718
Machine UsedTT Professional
Static
ASPS, RDC54
ASPS, FlexFour63.5
Racquet Flex, RDC63 - After stringing
Racquet Flex, FlexFour53
Weight, Grams328
Weight, Ounces11.57
Balance, mm321
Balance, Inch12.64
Length, Cm68.5
Length, Inch26.968
Head Width9.627
Head Length12.80
Head Area, cm2624.3
Head Area, Sq. Inch96.8
Beam Width, mm, Shaft, Center, Tip20, 23, 21
In Plane Stiffness, Pounds/In400.0 Lbs/In.
In Plane Stiffness, Kg/cm71.5 Kg/cm

Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.633
Main String Grid7.25
Cross String Grid9.40
Density (% of head filled with string).688
Average Cross String Space.490
Average Main String Space.445
Dynamic
Dynamic Tension, Kp, ERT35
Dynamic Tension, Lbs/in195.8
First Moment, Nm.808
Polar Moment324
Torsional Stability14
Swing Weight, Kg/cm2310
Swing Weight, Ounces10.93
Swing Weight Calculated338
Power, RDC47
Control, RDC54
Manueverability, RDC80
Power, Calculated 1889.7
Head Points6.77 (negative = head heavy)
Head Weight, %46.9%
Center of Percussion20.8
Dwell Time, ms, No Swing8.66
Effective Stiffness - lbs29.1
K, Lb/In (SBS) RDC173.06
Recoil Weight152.11
Twist Weight227.78
End Weight136.1
Tip Weight191.5
Total Weight327.6
9 O'Clock98.8
3 O'Clock97.5
Butt Cap131.3
Total Weight327.6

Head Graphene 360+ Radical MP v21

Well, this is one way to get 2021 of to a great start!  This eye popping Radical will certainly add excitement to your life!

This is truly orange with capitol O!  You simply need to see this racquet to really appreciate the color.

Radical MP v21

But, color aside, this racquet continues the Radical silo of aggressive racquets for the aggressive player, or those that want to be!

This review is the MP which has been one of the most popular models over the years and I am happy to say they have not messed it up as is so often the case when introducing new products!  This is a real Radical racquet!

A couple of things really stand out.  First the string pattern is more dense in the center of the racquet by a small amount which allows for a more open pattern at the periphery for more comfort.

The top eight (8) grommets are on a separate insert and they are “straight” instead of radial.

The addition of “sound grommets” is intended to enhance power via greater string movement. and optimize sound and vibrations.

And the “in plane” stiffness is a little lower meaning the string bed stiffness may be slightly less at the same reference tension, also contributing to comfort.

If you are looking for a high performance tennis racquet that has room for some weight as you require it, this is the one.  If you already need more weight that will be the Radical Pro that will be reviewed next.

 

Head Graphene 360+ Radical MP V21
ManufacturerHead
Racquet ModelHead Graphene 360+ Radical MP V21
Reference Tension55 lbs - 24.9 k
String: Main/Cross
Victrex 7718
Machine UsedTT Professional
Static
ASPS, RDC55
ASPS, FlexFour67
Racquet Flex, RDC63 - After stringing
Racquet Flex, FlexFour50
Weight, Grams315
Weight, Ounces11.11
Balance, mm330
Balance, Inch12.99
Length, Cm68.5
Length, Inch26.968
Head Width9.625
Head Length12.81
Head Area, cm2624.7
Head Area, Sq. Inch96.8
Beam Width, mm, Shaft, Center, Tip20, 23, 21
In Plane Stiffness, Pounds/In382.2 Lbs/In.
In Plane Stiffness, Kg/cm68.3 Kg/cm

Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.633
Main String Grid7.13
Cross String Grid9.31
Density (% of head filled with string).677
Average Cross String Space.484
Average Main String Space.445
Dynamic
Dynamic Tension, Kp, ERT35
Dynamic Tension, Lbs/in195.8
First Moment, Nm.803
Polar Moment330
Torsional Stability17
Swing Weight, Kg/cm2313
Swing Weight, Ounces11.04
Swing Weight Calculated343
Power, RDC46
Control, RDC55
Manueverability, RDC78
Power, Calculated 1909.3
Head Points3.94 (negative = head heavy)
Head Weight, %48.2%
Center of Percussion20.9
Dwell Time, ms, No Swing8.58
Effective Stiffness - lbs29.4
K, Lb/In (SBS) RDC176.28
Recoil Weight148.6
Twist Weight218.8
End Weight125.1
Tip Weight190.7
Total Weight329.2
9 O'Clock96.8
3 O'Clock96.7
Butt Cap120.0
Total Weight313.5