Roller Freestyle Glossary

The competitive discipline of inline skating that uses reinforced skates with an H-block and soul plates to grind rails, ledges, and copings, and to perform aerial tricks on ramps and bowls. The World Skate name for the sport is Roller Freestyle; "aggressive inline" remains the community shorthand and the two terms are interchangeable in event language.

A wheel setup with two large outer wheels (54–60mm) and two small inner wheels (around 42mm) that sit above the grinding surface, leaving the H-block clear to lock onto a rail or ledge. Anti-rocker remains the dominant setup for street-leaning riders because it grinds cleaner on long surfaces; the trade-off is slightly less roll speed and pump on transitions.

The steel or pool-block edge at the lip of a quarterpipe, bowl, or spine. In roller freestyle, riders grind coping on H-block, soul plate, or wheels, and amplitude above coping is read by judges as a difficulty and style factor in park scoring. The same word in skate refers to the same edge, but inline grinds engage it differently because the chassis sits below the boot.

A grind on the back foot's H-block with the front leg extended out to the side and the boot turned sideways, ankle hanging below the rail. The extended front leg gives the trick its distinctive silhouette. Reads as a higher-difficulty grind than royale because the back leg carries most of the rider's weight; alley-oop and topside variants raise the difficulty further.

A wheel configuration with four wheels of the same size, all four touching the ground. Trades grinding lock-in for roll speed and stability, so it favors park and big-air riders who pump for amplitude over riders who chase long technical rail grinds. The opposite of anti-rocker; rare in pure street, common in park and vert.

Shorthand for the rotation a rider adds entering and exiting a grind. "270-in" means the rider spins 270 degrees before locking the grind; "360-out" means they spin 360 leaving the rail. The notation chains: a "270-in to royale to 270-out" describes both ends of the trick. Judges read the in-spin and out-spin separately when assessing technical difficulty.

The plastic block between the second and third wheels of an aggressive frame, designed as the primary grinding surface. The name comes from its shape and the block locks onto rails, ledges, and copings without the chassis catching. Most modern grinds — royale, fishbrain, savannah, unity — set up against the H-block; soul plate grinds use the boot's outer plate instead.

A heat structure where multiple riders share an open floor for a fixed time block (typically 5–20 minutes) and the panel scores the session as a whole rather than per individual run. Blading Cup runs a jam format with judges naming best tricks; many grassroots opens use it because it speeds heats and matches how the community actually rides. Less common at World Skate-sanctioned events, which usually run timed individual runs.

A connected sequence of tricks performed across multiple obstacles within one run. A 50-second Park run might contain three or four distinct lines: drop in, hit the rail, transfer to the spine, finish on the deep-end coping. Judges read line connectivity as part of style and flow, and reward riders who use the whole course over those who repeat the same rail multiple times.

A one-foot grind with the back foot on the H-block and the front leg held away from the obstacle without a cross or extension. The simplest one-foot grind and a base for more technical variants — savannah is a makio with the front leg crossed; fishbrain is a makio with the front leg extended sideways. A clean makio on a kinked rail or coping still scores on execution and style.

A grind on the front foot's soul plate with the back leg trailing or extended behind, the body opened toward the obstacle. Topside mizou — landing above the rail rather than locking into the soul-plate side — is the higher-difficulty variant judges look for at World Cup level. The spelling is mizou in entity-canon usage; "mizu" or "miszou" are older transliterations that no longer match scene standard.

The foundational two-foot grind in aggressive inline: front foot on the H-block, back foot on soul plate. Royale is the building block for fishbrain, soyale, unity, and savannah — judges read the royale base before they assess the more technical variants. A clean royale on a long, even rail is a low-difficulty reference; the same trick on a kinked or sloped rail rises in difficulty quickly.

A timed performance in which a rider strings tricks across the course. World Skate Roller Freestyle Park and Street runs are typically 45–60 seconds depending on the event bulletin (50 seconds at FISE Montpellier and the 2025 World Championships in Sakai). The panel scores the run as a whole on a 0.01–99.99 scale, and best run counts at World Cup and World Championship events.

A one-foot grind on the back foot's H-block with the front leg crossed in front of the grinding leg, sweeping over the obstacle. Reads as harder than makio because the crossed-leg balance shifts the body's center of gravity. Switch and topside savannah are common high-difficulty street grinds and a hallmark of technical rail riders.

The outer plastic plate on the boot that runs along the foot's side, used as a grinding surface for soul, mizou, makio, and savannah-side grinds. Soul plates are replaceable wear parts — most pro skaters cycle through them across one heavy season. The grinding surface area and bevel are part of why USD, Razors, and THEM skates ride differently; soul plate geometry shapes which grinds lock in cleanest.

Royale's mirror cousin: front foot on soul plate, back foot on H-block. The opposite weight distribution from royale, which makes it read differently — soyale puts the back of the chassis on the rail instead of the front. Topside soyale and switch soyale are common World Cup combinations. Judges read its technical difficulty against royale on the same obstacle; soyale typically scores slightly higher because of the back-truck balance demand.

Changing from one grind to another mid-rail without coming off the obstacle. A royale-to-fishbrain switch-up on a long rail scores as one chained trick rather than two separate grinds. Judges read switch-ups as a technical difficulty marker, especially when both grinds in the chain are technical (e.g., topside soyale to topside mizou). Multiple switch-ups in one rail are a hallmark of advanced street.

Also called AO (alley-oop) when the entry direction reverses. A grind locked above the rail rather than against the H-block or soul-plate side — the boot sits on top of the rail, the wheels hang to one side. Topside variants of royale, soyale, fishbrain, and mizou are read as higher difficulty than their standard versions because the lock-in is narrower and the balance is harder. World Cup riders chain topside grinds across long kink-rails.

Spin direction relative to the rider's lead foot. A true-spin rotates toward the body's natural direction; a neg-spin rotates opposite to it. Neg-spins are read as harder because they fight the rider's instinctive rotation, so the same 360 on the same gap scores higher as a neg-spin than as a true-spin. Judges use spin direction as a difficulty marker alongside rotation count.

A two-foot grind with the back leg crossed behind the front leg, both feet on the obstacle — typically front foot on H-block, back foot on its own H-block. The crossed-leg posture removes the natural triangle stance, making it harder than royale or soyale. Switch and topside unity are common high-difficulty rail tricks at World Cup level.

A format unique to roller freestyle and a handful of action sports: athletes submit a short edited video filmed over a multi-week window, panels judge the videos remotely, and results stream on social platforms. Razors and USD have run sponsored video contests; Blading Cup has hosted video divisions alongside the live event. World Skate does not sanction video contests at the moment, but they are a major part of how the global inline scene measures progression.

Riding the wheels along a vertical wall surface — typically a smooth wall section attached to a quarterpipe or a freestanding feature in a street plaza. Higher and longer wallrides read as harder, and wallride-to-grind transfers (wallride into a rail grind on dismount) score as chained tricks. The community standard is that a wallride counts when both skates touch the wall surface for at least one full rotation of the wheels.