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ACCU-Tread™
A tried and true coverstock material introduced in the late 1990s that set the standard for modern shell technology.
Approach
The area immediately in front of the lane before the foul line measuring at least 15 feet in length and not less than the width of the lane.
Asymmetrical Core
A ball where the RG (radius of gyration) values of the Y (high RG) and Z (intermediate RG) axes of the ball differ by more than 5% of the total differential of the ball.
Axis Migration
Path of which the axis point travels across the surface of a ball as the ball travels down the lane; this path will always have the approximate same RG measurement as the ball travels.
Axis Point
One of two points located on opposite poles marking the end points of the axis of rotation.
Axis Rotation
The measurement of horizontal angle through which a ball rotates; rotation is synonymous with the amount of "side roll" a bowler has.
Axis Tilt
The measurement of the vertical angle through which a ball rotates; tilt is synonymous with the amount of "spin" a bowler has.
Back End
The angle or degree of hook at the breakpoint. Back End is not where the ball hooks, but how much it hooks when it hooks.
Back Ends
Portion of the lane after the lane conditioner ends up until the pins.
Balance Hole
An extra hole, drilled in a specific position, that is used to either fine tune a ball's reaction or bring it within legal game play specifications.
Ball Track
The portion of the bowling ball, which comes in contact with the lane as it rolls down the lane.
Break Point
Occurring during the hook phase, the break point is the position on the lane where the ball is the closest to the outside, or the apex of the curve. Note that arcing balls have a longer hook phase than the comparatively short hook phase of a 'Skid/Snap' reaction.
C.A.M. ™
(Continuous Axis Migration) - The C.A.M. ™ weight block was introduced in the Reign in 2009. This weight block offers weighted disks that produce a large amount of entry angle along with its shape that generates continuous axis migration.
C3™ Centripetal Control Core
Introduced in the IQ™ Tour Edition in 2012, the C3 - Centripetal™Control Core is engineered to yield ample midlane roll while smoothing out the transition. Unlike the regular Centripetal™ core, which has a much higher differential rating, the C3 has less dense materials which lowered the differential and this allowed for more control.
Cadmium™
ACCU-Tread base coverstock material plus exclusive Storm particles which increased friction between the ball and the lane.
Camber™ Core
Introduced in the Breeze series, the Camber core comes with smooth contours that provide predictability and control.
Carry-down
Refers to the oil that travels to the previously-dry backends. This condition results in less overall hook.
Center of Gravity
The imaginary point inside a body of matter where the total weight of the body is thought to be concentrated.
Centripetal™ Core
Originally introduced in the Prodigy in 2010, the Centripetal™ core offers a lower RG for quicker revving motion along with an integrated symmetrical design for maximum versatility.
Coefficient of friction, COF
The ratio of the force opposing the relative motion of two surfaces and the normal force acting perpendicular opposing force. In bowling, this term usually defines the interaction between the coverstock, lane conditioner, and lane.
Coefficient of restitution, COR
The ratio of the energy of two objects after impact to the energy before impact. In the case of a ball striking a pin, this is the percentage of energy transfer from the ball to the pin.
Conventional Grip
The method of drilling in which the fingers are inserted to the second knuckle and the thumb is fully inserted.
Core
The interior section of the bowling ball consisting of a light-weight filler material, often surrounding the dense weight block shape.
Core Torque
The mass distribution within the arms created by the core (or weight block). Core torque is an assigned value of the balls ability to combat rollout, the complete loss of axis tilt. High torque (High RG) balls are more effective than lower torque (Low RG) balls at delaying rollout. High torque balls will also tend to react more violently on the backend than lower torque balls, which roll more even, displaying a more predictable transition from skid to roll.
Coverstock
The outer shell of bowling balls, which can be constructed with a variety of materials such as Polyester, Rubber, Urethane and Reactive Urethane.
Cranker
High rev. rate/High axis rotation a player that prefers to play the swing shot, throwing the ball towards the gutter, looking for a big, late backend reaction.
Curelyon™
One of Storm's first reactive coverstock materials.
D-Scale
Refers to an instrument (Durometer) used to measure the hardness of the coverstock of a bowling ball.
Differential
The difference of the radius of gyration of a bowling balls X axis (the weight block vertical) compared to the radius of gyration of the same balls Y or Z axis (the weight block horizontal). Differential is an indicator of a bowling balls track flare potential. Bowling balls with lower differentials are more stable, therefore generating less track flare potential. Bowling balls with higher differentials are unstable, therefore generating a much larger track flare potential. Also, differential is a guide to the internal versatility of a ball. It can indicate just how much of a length adjustment can be made through drilling. Balls with lower differential will allow only modest length adjustments whereas balls with higher differential may translate into a length window of up to 5-times that of low differential balls.
Dull
The surface of a bowling ball, typically without polish, that has a greater amount of friction when in contact with the lane. This is typically a result of sanding a ball with a low grit abrasive surface. (Synonym - Sanded).
Entry angle
This is the angle at which the bowling ball enters the pins relative to the longitude of the lane.
EOX™ Technology
EOX technology, introduced in 2005, create a wide footprint and produced a strong ball motion throughout the entire lane.
Equator
The high RG plane of a bowling ball in symmetrical balls.
ETM
Enhanced Traction Mica
Fingertip Grip
Method of drilling where the thumb is fully inserted to the base while the fingers are inserted only to the first knuckle.
Flare
The migration of the ball track from the bowler's initial axis (the axis upon release/PAP) to the final axis (the axis at the moment of impact with the pins). Flare is a length modifier. Flare is used to expose fresh, dry ball surface to the lane surface, the entire length of the lane. The greater the Flare, the greater the amount of friction between the ball and the lane; the greater the friction, the greater the hook potential of a ball.
Flare Potential
The maximum amount that the axis of a bowling ball can migrate given the construction of the ball provided that the bowler has a maximum power release. Flare potential can also be used to indicate which balls will be better suited for oily conditions (high flare balls) and which balls will be better suited for dryer lane conditions (low flare balls).
Friction
A physics term, when used in bowling, that describes the amount of resistance a ball sustains when in contact with the lane surface. Friction, in bowling terms, is the key factor in converting translational energy (forward speed) into rotation energy (hook).
G2™ Core
The G2™ Core was introduced in 2013 with the release of the Sync™. The second generation of the original Shape-Lock™ HD Core, this shape incorporates a large intermediate differential to produce a strong response to friction.
Grit
Pertaining to the texture of the surface of the ball, whether polished or sanded.
Heads
The portion of the lane, which extends from the foul line, past the arrows, and to the pine. Usually, this is assumed to be the first 20 feet of the lane.
Hook Phase
Described as a curve, this is the second of three phases of ball motion where the ball has encountered enough friction to change direction. It is in this phase where the break point occurs.
Hook Potential
Refers to the number of boards one ball will cover relative to another.
Intermediate Differential
The difference in radius of gyration between the Y (high RG) and Z (intermediate RG) axes on the bowling ball.
Inverted Fe2 Technology™
Introduced in the Thunder line of balls, this weight block produces a lower RG with a quicker spin time that gave bowlers one of the most well liked ball motions ever created.
Inverted Fe3™ Technology
Originally introduced in the Victory Road in 2011, the Inverted Fe3™ weight block has a larger weighted ball to maximize down-lane motion along with a weighted disk that provides dynamic balance.
Lane Conditioner
Lane Oil
Substance that was developed to reduce friction between the ball and the lane, with the ultimate goal of protecting the lane surface. The greater the volume and length of the oil, the longer the skid phase of the ball before it can transition into its final hook/roll phase. Oil placement can greatly affect scores.
Launch Angle
The angle in which the ball exits your hand at the point of release.
Length
An evaluation of how far a ball will travel before it begins to hook. Length does not include skid caused by lane conditioner, additional fine sanding, or the use of polishes.
Leverage Point
The position located 3-3/8 from the bowlers positive axis point (PAP). Positioning the Pin of a bowling ball on this point, relative to the PAP, creates the most track flare and over all hook of a bowling ball.
M.A.D.™ Core
Known as Maximum Accelerating Disk technology, the M.A.D™ core optimizes the shapes of the RG planes to help dial in your desired reaction.
Mass Bias
Also known as PSA (see definitions), this is typically the highest RG location of the ball, and its position relative to the bowlers initial PAP has a great effect on the subsequent ball motion.
Midlane
Area past the heads to the end of applied lane conditioner.
Midline
A horizontal line half way between the fingers and thumb.
Midplane
A line perpendicular to the midline that extends through the positive and negative axis points. This line divides the top and bottom halves of the ball on the bowlers axis of rotation.
Moment of Inertia
Resistance to change in rotation.
Monsoon™
This shell material created great traction especially on drier backends.
N.O.S.™ Core
Originally introduced in the 2 Fast and 2 Furious in 2010, the N.O.S. weight block offers a tri stack design for enhanced mid-lane motion along with a weighted disk that provides dynamic balance.
NRG™ Nano Reactive Genesis
Originally introduced in the Virtual Gravity™ Nano in March of 2011, this coverstock produced one of the strongest ball reactions the bowling industry had ever seen. This is in part to the micro-dynamic enhancements or Nano technology.
Oil Patterns
The way oil is distributed onto the lane. Here are the most common used in bowling centers. Top Hat Heavy oil in the middle and very light on the outside. Christmas Tree More oil in the middle than the outside. Tapered to the outside throughout the entire pattern. Sport Permits ratio of 2:1 oil from inside to outside portion of the lane. Used on PBA and PWBA tours. Flat Same amount of oil applied across the entire lane. Reverse Block More oil applied to the outside boards than in the inside.
Origin™ Core
Originally introduced in the Invasion in 2010, the Origin™ Core offers intersecting contoured bands to optimize entry angle to the pocket.
PAL
Perpendicular Axis Line
Also Known As: Vertical Axis Line (VAL)
PAP (Positive Axis Point)
The point upon which the ball rotates off of a bowler's hand, closest to the bowler. PAP values are typically identified by a coordinate system by measuring 'X' number of inches over and 'Y' number of inches either down or up.
Particle
Any additive mixed into the coverstock to change the interaction between the bowling ball, lane conditioner and the lane. Storm first introduced particle technology in the La Nina™.
PFT™ Progressive Friction Technology
Introduced in 2012 on the IQ™, this coverstock emphasizes the break point angle as it grips the dry boards. Due to the chemical blend, the PFT™ coverstock will provide continued friction even after leaving the oil.
Pin
A small factory plug that signifies the center of the weight block in most bowling balls.
Pin Buffer
The distance the pin is from the bowlers Perpendicular Axis Line or PAL (also called Vertical Axis Line - VAL).
Pin Deck
The area of the lane on which the pins are spotted.
Pin In
Refers to the weight block being centered in the ball. When this occurs, the pin is within 1 from the cg.
Pin Out
Refers to the weight block not being centered in the ball. When this occurs, the pin will be more than 1 from the cg.
Pines
Generally referred to as the middle 20 feet of the lanes. Actually, on wood lanes, it represents the 45 feet between the arrows and the head pin.
Pitch
Angle at which holes in the bowling ball are drilled.
Polyester
A coverstock comprised of plastic material. Generally displays a mild ball reaction, and limited durability.
Pro-CG
Used often on the Pro Tour, a Pro-CG is created when the CG ends up away from the line drawn between the Pin and the Mass Bias (MB). When drawing this line between the Pin and MB, you will find the CG located within two regions on either side of this line. An arc is drawn to the left side of the line approximately 2 and another arc is created to the right side of the line approximately 1 . If the CG is located outside of these two arcs, it is determined to be a PRO-CG. Note that this is a first quality ball and lends itself to several special drill options.
Pro-Glide™
A mild reactive coverstock designed for drier lanes.
Pro-Pin
Also popular on the PBA Tour, a Pro-Pin is where the Pin distance from the CG is 5 6 out. Anything more than 6 would be termed an X-Blem. This is a first quality ball and lends itself to several special drill options.
Pro-Thane™ Coverstock
ACCU-Tread base coverstock material + TDR (Thermo-Dynamic Response) Particles.
Pro-Thane™ LT
Lightest load of particles.
Pro-Thane™ LT Plus
Medium-Light load of particles.
Pro-Thane™ MT
Medium load of particles.
Pro-Thane™ MT Plus
Medium heavy load of particles.
Pro-Thane™ XT
Heaviest load of particles.
PSA
Acronym for Preferred Spin Axis, this axis is indicated by the lightning bolt on Storm Premier™ line bowling balls. Often termed the mass bias as it has the highest radius of gyration value, the PSA can be viewed as a secondary pin which helps fine tune ball motion.
R2S™
This coverstock was a chemically-enhanced material that originated from one our most famous coverstocks, Reactor™. It was introduced originally in the Special Agent™ in 2007.
R2X™
First introduced in the Gravity Shift™ in February of 2008, the R2X™ coverstock was derived from the R2S™ cover but with new chemical additives that created more friction.
Radius of gyration, RG
Measured in inches, radius of gyration is the distance from the axis of rotation at which the total mass of a body might be concentrated without changing its moment of inertia.
RAD™ Motion Control™ Technology
Radial Accelerating Dual Density Disk.
Reacta-Fleck
Polyester chips or flakes, that are added to the shell material for both performance and appearance characteristics. The Reacta-Fleck is large flakes that are added to the coverstock material and protrude from the surface of the ball. This provides for more friction between the ball and the lane than conventional reactive coverstock material.
Reactive Urethane
A coverstock comprised of similar materials used in urethane formulations, however blended with different additives. This coverstock adheres to lane surface, creating the most backend reaction, the least deflection and the most hitting power of any coverstock manufactured today.
Reactor™
One of Storm's most popular reactive coverstock materials. This material glides easily through the heads yet provides ample friction on the drier backends.
Revolutions
The number of times in which the weight block makes one full rotation around the axis line, as it rolls from the foul line to the head pin.
Roll Phase
The third and final phase of ball motion where the ball is traveling on a linear path towards the pins.
Scotch-Brite
This is an abrasive that is used to scuff or sand the ball surface to create different ball reactions or used to resurface the ball cover after the wear and tear from use. We recommend these 3 types of grits. 1. Burgundy this is the roughest and equates to 240-grit sandpaper. 2. Green this is the medium textured pad and it will produce a 500-600 grit finish. 3. Grey this is the smoothest and finest grit pad. Will adjust the surface to an 800 finish.
Serial number
An identifying series of numbers and/or letters in order to identify a specific ball.
SFA™
Specially-formulated reactive coverstock which produced great all-around performance.
Shape-Lock™ HD Core
Originally introduced in the Gravity Shift in 2008, the Shape-Lock™ HD Core offers a tight spin radius for heavier oil patterns along with a weighted disk that maintains dynamics after drilling.
Skid Phase
The first of three phases of ball motion; the ball path is in a straight line and has not yet encountered enough friction to begin its hook phase.
Skid/Flip
Refers to a ball reaction where the ball skids through the heads and midlanes of a lane and rapidly transitions from the hook phase to roll phase in backends. This is typically a violent and angular ball reaction.
Span
The distance between the thumb and finger holes in a bowling ball.
Static Weights
The dynamic weight difference when comparing the finger region to the thumb region, the left side to the right side, and the top of the ball to the bottom.
Stroker
Slow rev. rate/Low axis rotation a player that will play the lanes down and in covering very few boards.
Surface
The composition of the outside of the bowling ball. Also refers to the texture of the coverstock of a bowling ball.
Surface Roughness - Ra
The arithmetic mean of the peak to valley distances over an evaluation distance.
Surface Roughness - RS
The arithmetic mean of peak to peak distances of the local peaks in the evaluation distance.
Symmetrical core
An undrilled ball utilizing a core where the RG (radius of gyration) values of the Y (high RG) and Z (intermediate RG) axes of the ball do not differ by more than 5% of the total differential of the ball.
Symmetrical weight block
An undrilled ball utilizing a weight block where the RG (radius of gyration) values of the Y (high RG) and Z (intermediate RG) axes of the ball do not differ by more than 5% of the total differential of the ball.
Synthetic
In bowling terms, any pin or lane product not made of wood.
Three Piece Construction
A bowling ball constructed of three elements: the coverstock, the filler material and the high-density inner core.
Total Differential
The difference between the X (low RG) and Y (high R) axes values of any bowling ball.
Traction
The friction between an object and the surface on which it moves.
Turbine™ Core
The Turbine weight block is specially designed for a tighter spin that minimizes energy depletion along with a weight disk that provides dynamic balance. This weight block is better known as the light bulb shape.
Tweener
Medium rev. rate/Medium axis rotation a player that likes to belly the ball slightly, but prefers a fairly controllable reaction overall.
Two Piece Construction
A bowling ball constructed of two elements: the coverstock and the weight block. A modified two piece bowling ball has the same basic characteristics of a two piece ball, only the weight block has been modified to change the dynamics of the ball (i.e. dual density weight block).
Two-handed approach
This techniquie is used by both Jason Belmonte and Osku Palermaa. Both hands are placed on the ball and left on the ball throught the swing until release. At the point of release, a dominant hand releases the ball thereby being a one-handed delivery. Additionaly, the dominant hand is determined by the side of the body about which the ball swings.
Typhoon™
A Storm reactive coverstock material which minimized friction in the head area.
U1S™
The U1S™ is a first generation urethane-based material that is very similar to the balls before reactive resin. U1S™ is designed to generate a lower amount of friction and produce a straighter, more controllable reaction on the lane.
U2S™
U2S™ is a second-generation urethane based material which was introduced with the Natural in June 2009. It generates a low amount of friction for a straighter ball reaction. Somewhat stronger than U1S™, this cover has been proven on the PBA Tour for high rev players, burned up oil patterns and short/light oil.
Ultra-Fleck
This is a polyester chip or flake that is added to the shell material to both performance and appearance characteristics. This flake is only 50% of the size of flake in the Reacta-Fleck. These smaller flakes provide for a smoother ball reaction at the breakpoint.
Urethane
A coverstock comprised of material from the polymer family which creates a hard, durable surface on the ball.
VAL
Vertical Axis Line
Also known as Perpendicular Axis Line (PAL). This is defined as the line perpendicular to your midline that continues through your PAP.
Weight Block
The dense inner component which is composed of various materials and shapes. This is considered to be the motor of the bowling ball. Differs from the core (see Core definition).