Seismic Fullspin 7-Ball Ceramic Pro Spec Built-In Kugellager

Classic configuration. Best overall balance of speed and resistance to frequent impacts and side loads. Recommended for high-speed turning and sliding (e.g., DH, Freeride, Slalom, Luge, Pump Track) and all style / trick disciplines (e.g., Street, Park, Pool, Ramp, SurfSkate, Flatland and Longboard Freestyle).

Compared to Steel balls, Black Ceramic balls are lighter, smoother, harder, lower in friction, self-lubricating, more heat-resistant, and completely rustproof. These properties combine to increase acceleration and speed… while also continuously scouring and cleaning the raceways for extended bearing life.

Markedly superior to the White Ceramic balls used in budget Ceramic bearings – formed of Alumina Oxide (Al2O3), those have a higher friction coefficient and don’t dissipate heat as well.

Manufactured to Grade G10 standard – and with superior Pro Spec dimensional precision – for truer, lower-friction ball spin inside bearings; less energy loss; more speed; and longer bearing life.

Compared to balls used in run-of-the-mill skate bearings, G10 specs are 60% – 80% tighter for concentricity (roundness), and 50% – 67% stricter for surface smoothness. (In simpler terms, twice as smooth as the finest cue ball, 10 times as smooth as a mirror finish.)

Manufacturing specifications for raceways and assembly are highly technical considerations, but absolutely mission-critical to overall bearing performance. Unlike other skate brands, Seismic fully committed to mastering the science and optimizing every last parameter.

See footnote below for the finer points.¹ The important takeaway is: Specs as tight and accurate as Fullspin’s are only possible at the very biggest, best-equipped, and most skillful factories in the world. The average small skate bearing producer can’t even come close.

The bottom line for rolling performance: Fullspin’s world-class factory tolerances result in significantly less internal play, friction, wear, and noise; and noticeably superior speed, handling, and durability!

¹ Radial clearance (gap between balls and raceway surfaces) held within a super tight and narrow range, with remarkably little deviation from the exact middle. Synergizes with extra-strict raceway curvature radius for outstandingly balanced load distribution across balls – a key determinant of overall bearing efficiency and toughness. Raceway surface finish up to 40% smoother than well-known brands. Superior tolerances for outer and inner ring concentricity (roundness), too.

Inner and outer rings precision-machined from superior XT™ steel with advanced heat treatment that fully optimizes metal’s crystalline microstructure. Premium carbonitriding1 then dramatically boosts surface hardness, priming the raceways to hold precise curvature and exquisitely smooth surface finish like nothing else! Pro Spec bearings stay tight and fast noticeably longer than any other tech ever seen.

Outer rings are thicker and 60% stiffer than those seen on most other skate bearings (made with inferior steel). So they resist flexing, spin truer and faster, and keep seals from popping off on extreme impacts. Premium black oxide surface treatment adds exceptional corrosion resistance.

Radius reduced to bare minimum on all edges of both outer and inner rings – for fuller contact and more stable alignment inside bearing pockets of finer wheels; on axles of finer trucks; and at Built-In spacer interfaces. A Fullspin first!

1 Carbonitriding is an advanced high-heat surface treatment that infuses carbon and nitrogen into steel at the molecular level. The result is an exceptionally hard case layer that provides superior resistance to wear, fatigue, and impact stress. The extra-hard skin also responds more favorably to high-end grinding / honing processes. This next-level metallurgy is like armor for the bearing raceways, making them significantly tougher as well as smoother.

Fullspin’s patented Built-In spacer interface is quite simply the most advanced bearing alignment tech ever seen in the skate world, full stop.

Integral half-spacers with extra-wide flanged ends* (U.S. Pat. #9,126,101) square up inside wheels with more than double the contact area of ordinary Built-In interfaces – powering absolutely unparalleled alignment precision and stability.

System corrects for off-spec axles and misaligned bearing seats.1 Levels and steadies all working components of seated bearings far better than any other design (Built-In or Classic), to unleash near-perfectly optimized paired performance.

Synergizes with all advanced features in individual bearings to maintain exceptionally consistent wheel contact and grip; support extremely predictable slide performance; and noticeably extend both wheel and bearing life.

Built-in spacer lengths calibrated to extra-strict 0.400-inch combined width tolerance, to support highly accurate positioning of paired bearings inside finer wheels with well-engineered hubs.2

Flange components precision-machined from premium bearing steel with advanced heat-treatment for unmatched strength, toughness, and press-fit stability.3

Radius reduced to bare minimum on all edges (ends of flange components and extended inner rings), for fuller contact and more stable alignment at half-spacer interfaces.

Inner ring bore specs dialed to maintain exceptional straightness on finer axles. Extends 0.5mm on outer (seal) side, eliminating need for washers at hanger and nut interfaces.

* Note: The broad Fullspin XT Built-In half-spacer ends may not fit into hub-less street wheels with extra-thick urethane bearing supports – which sometimes leave the wheel’s central hole smaller than the flange (15mm in diameter). Choose Fullspin Classic or Fullspin LITE Built-In bearings for wheels of this kind.

1 Common issues include micro-flaws in axle diameter, axle concentricity, axle straightness, bearing seat levelness, and bearing seat spacing.
2 Oversized built-in spacers seen in some well-known brands prevent at least one bearing in each wheel from fully seating. Wheels are then prone to lurching back-and-forth on the bearing stacks during hard turns and slides – causing inconsistent grip and slide behavior and prematurely-worn bearing pockets.
3 Matching coefficients of thermal expansion ensure extremely stable press-fit between the flange component and the inner ring (machined from identical steel).

Packed with premium “high-RPM” light grease from Kyodo Japan. Formula and volume calibrated for peak performance in racing conditions, not max free-spin time. Just press into your wheels and go!¹

Note: Free-spinning bearings or wheels by hand, under zero load, is not a meaningful measure of real-world performance (though none of us can resist free-spinning fresh new wheels and bearings). Fullspin’s advanced lubricant is designed to perform best when warmed up under the load of a human skater who’s rolling, turning, and sliding on real asphalt or concrete.²

¹ Do not clean / re-lube – or add extra lubricant to – brand new Fullspin bearings. The factory-installed Fullspin grease is better than any available aftermarket oil. Wipe grime off outer seals whenever excess builds up. Clean and re-lube bearings only as needed, depending on how often and where you skate – more frequently if you ride through water, mud, dirt, or sand. When cleaning, do not remove outer seals or disassemble in any way; just soak in isopropyl alcohol (70% solution or greater), rinse, and let dry. Avoid excessive cleaning, which increases risk of accidental damage to small internal components, as well as citrus-based cleaning solutions, which cause corrosion.
² Bearings may gain extended free-spin time if they’re under-lubricated, or lubricated with very thin oil, or assembled too loosely. But under real-world skating stresses, they won’t perform as well or hold up as long as high-quality bearings with tight assembly tolerances and appropriate lubricant – even though the latter may have a shorter free-spin. Most skating speed records have been set on bearings with modest free-spin. What matters is how bearings handle under the load of a human rider’s bodyweight – rolling, turning, and sliding on real asphalt or concrete.

Removable rubber-coated “no contact” steel seals with printed graphic. Edges of seals slot inside V-shaped grooves machined into both outer and inner rings. This “Labyrinth” interface maximizes resistance to dust and debris – which can only penetrate the bearing by navigating a twisting, maze-like path around seal edges.

Note: Seals protect bearings from environmental contaminants, which significantly accelerate wear. Properly-made “no contact” seals do not add friction. Brands that promote completely unsealed bearings just want you to wear yours out faster so they can sell you another set (that will also wear out prematurely).

Fullspin’s custom ball retainers keep bearings cleaner for longer, without the addition of a second seal. They feature an expanded outer diameter that slots into a groove in the outer ring just like a second seal – to form a unique integral barrier against dirt and grime.

Molded from an engineering-grade fiber-reinforced composite specifically formulated by the German producer for high stiffness and dimensional stability in bearing retainers and similar components. Pro Spec retainers feature a premium extra-tough, lower-friction version of this material.

We don’t bother with the ABEC rating system, which measures only the most superficial dimensional tolerances of the outer and inner rings – all of negligible relevance to real-world skating performance.

Other bearing brands frequently inflate or fabricate ABEC ratings to mislead the buying public. But even when accurately measured and reported, low-versus-high ABEC ratings have no direct correspondence with poor-versus excellent skating performance in the real world.

No wasteful, oversized metal tins or plastic cases – just a minimal recyclable cardboard box. Bearings and spacers wrapped inside VCI (“Volatile Corrosion Inhibitor”) paper – another Fullspin first! Adds superior protection against corrosion during transit and long-term storage of unopened packages.

Just superior performance through genuinely advanced, no-BS engineering; highest-quality materials and components; and highest-precision manufacturing.

100% FREE OF:
– Random bearing tech inappropriately adapted from other industries solely for the sake of novelty.
– High-sounding raceway coatings that interfere with optimal finishing and cause abrasive damage to ball surfaces.
– Flashy lubricant additives that accelerate wear not speed.
– Bombastic references to features and processes like the following (all totally ordinary and unexceptional at any decent, self-respecting skate bearing factory): deep-groove raceways with micro-channels, fine-polishing, fiber-reinforced nylon retainers, hand-inspection, and ultrasonic solvent washing.