Inlineskate Hardware : Hardware on Aggressive inline skating U-18

Aggressive skates are identifiable from recreational or speed skates by a prominent gap in between the second and third wheels (The H-Block) which allows for grinds perpendicular to the direction of the wheels. A hard plastic surface on the sole of the boot known as a "Sole plate" or "Soul Plate" allows grinds parallel to the direction of the wheels. From these grind surfaces comes a lexicon of well known grind stances, though sliding can occur on any surface of the boot or wheels. Aggressive skates typically have much smaller wheels than a traditional inline skates. The small size allows for more freedom when grinding as there is less risk of catching on obstacles. Additionally these small wheels feature a flat profile to accommodate the impact from jumping tall heights. In recent years aggressive skates have begun to adopt larger frames and wheels, in what is seen as a bridging of the various inline disciplines. ^[8]

In general, aggressive inline skates are specially to be tougher and stronger than normal inline skates, due to the high levels of stress placed on the skate by the stunts and tricks a skater performs. A typical skate consists of a number of different parts.

Part	Definition
Cuff	an ankle support cuff with an adjustable strap
Shell	a boot made of high-impact plastic that surrounds and protects the feet
Liner	a soft inner boot
Buckle	cuff locking system
Shock Absorber	soft resin part placed under liners that absorbs impact from landing
Soul plate	a flat, hard plastic plate on the outer sole of the boot. Modern models have replaceable soul plates
Negative soul plate	a flat, hard plastic plate on the inner sole of the boot
Frame	a hard plastic chassis for the wheels. UFS - Universal Frame System is unified type of frame with flat top area and fits all modern skates
Backslide plate	a grinding area flush with the soul plate, near the middle of the boot, used for grinding on the boot
H-Block	area on frame between inner wheels that locks on obstacle and grinds
Wheels	two to four polyurethane wheels with bearings
Anti-rocker wheels	the two inner wheels smaller diameter made of plastic or hard urethane placed in the middle of frame, installed to make grinds easier on wider surfaces.

Typically each part is replaceable, and certain manufacturers provided parts that have been divided into individual sections, so a skater can replace specific worn areas.

Frames

The chassis of the skate, called the frame, bolts to the bottom of the skate. Skaters grind on the frames, which are designed for this purpose. Sometimes they plant the outer frames horizontally on a rail or ledge surface to execute so-called topside grinds.

There are several different variations on frame design. Originally a skate had four wheels on each skate, with a gap between the middle wheel where a plastic insert called an H-block was used for grinding. During earlier times, a plastic plate, known as the grind plate was attached to the frame on the outside of the two middle wheels instead of an H-block. This allowed normal recreational skates to be converted into aggressive skates, and it was how most aggressive skates were built at the time. On aggressive skates with H-blocks, the grind plate could be used to increase the life of the H-block. But as frame manufacturers began making removable H-blocks, the grind plate fell out of favor. As the sport evolved, skate companies started manufacturing wheels that were intentionally hard and undersized, in order to facilitate grinding. The undersized wheels are called anti-rockers, and replace the two middle wheels.

Generally, there are three different types of modern frames: flat, anti-rocker, and freestyle. Flat, as described above, means there are four wheels per skate. There is another variation of this called the Hi-Lo setup. This means it has large outer wheels, but small inner wheels to make grinding easy. The inner wheels' axles are closer to the ground so that all the wheels touch the ground.

Anti-rocker, as also described above, is the most popular setup. Freestyle frames have no inner wheels, giving the user a large amount of space in the middle for grinding. Another setup that's gaining popularity, called tri-rocker, means that there are three wheels per skate. The remaining axle hole is left empty or replaced with an anti-rocker wheel. This combines the benefits of a flat setup (going fast and turning easily) with the benefits of an anti-rocker/freestyle setup (grinding easily). The frame company Create Originals makes frames that are meant for tri rocker to be a possibility.

In the late 1990s, the Universal Frame System (UFS) was introduced by frame manufacturers to allow the user to easily customize their skates.^[9] This led to increased customization of skates within the sport by allowing the user interchangeability between different companies' frames.^[9] Today, all major frame and skate manufacturers support UFS.

Wheels

Modern skate wheels have undergone many years of development and iteration. The development of the main material, polyurethane (usually simply called urethane), has been dependent on advancements in the polymer industry. The balance between hardness and grip is the key to an optimum skate wheel. Aggressive skate wheels are usually between 54 and 72mm, while anti-rocker wheels are between 40 and 47mm.

Anti-rocker wheels

Two high density polyurethane or plastic wheels between 40 and 47mm, replacing the inner two wheels. The name is derived from the nature of flatrocker setups to "rock" (become unstable) over concave or convex surfaces. Eliminating the center wheels eliminates the instability by reducing the number of contact points the skate has with the ground. Some skaters prefer replacing only one of the inner wheels with anti-rockers (called tri-rocker). Anti-rocker wheels enable skaters to grind obstacles with a relatively high diameter. These wheels unlike "normal" (larger, softer) wheels, give skaters the ability to approach obstacles in ways they might not be able to otherwise. This depends on boot dimensions/style, frame dimensions/style and skater dimensions/style. While larger wheels leave less of a gap between them, the smaller anti-rocker wheels bring the surface of the edge being grinded closer to the frame. At the same time the added space between the center wheels, allows for the entire skate to be angled farther forward for a more centered position over the edge. The lower coefficient of friction slides faster than that of a softer wheel, so it may unobstructively rest on the horizontal surface(s) of the obstacle, allowing for the aforementioned angle/position of the boot/skater while grinding. This is an angle that may be impossible to achieve with certain frame/flatrocker combinations on certain obstacles. An anti-rocker setup would be used at the skaters discretion, based on the terrain they planned to skate, and way they wish to skate it. One disadvantage of an anti-rocker setup is the speed that is lost, as four load bearing wheels are removed, and the weight distributed to each of the remaining is increased. Further more, with wheels only being present on the front and back of the frame, it is harder to turn or carve with an anti-rocker setup. It can feel a bit like the skates are on a rail and only want to go straight.

Wheels

Skate videos began in 1994 with the release of The Hoax: An In-Line Crime. K2 Sports, Salomon and Rollerblade were early proponents of the sport and released their own videos. Senate, arguably the first inline-only company, released a number of influential films during the 1990s.^[10] Videogroove, Mindgame, Razors, KFC, and Valo released a number of notable films during the early 2000s. During this period the genre transitioned from VHS to DVD like much of the rest of the entertainment industry. They have similarly transitioned to the digital format since the 2010s.

Skate videos, like their skateboarding and BMX counterparts, feature skaters both professional and amateur, in "edits," segments of skating usually accompanied by one or more songs. Music is often used without permission. Alternatively, original music is sometimes created specifically for the film.

A 2006 documentary, Barely Dead, gives an overview of skating, focusing on its popularity and decline.

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Hardware on Aggressive inline skating U-18

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