Seismic Fullspin® 6-Ball Steel XT™ Built-In Bearings – Maximum speed and precision for downhill and long-distance skating
The Seismic Fullspin® 6-Ball Steel XT™ Built-In represent one of the most advanced developments in skate bearing technology. Developed over more than two years in collaboration with one of the world’s most prestigious bearing manufacturers, they have been designed to offer an exceptional combination of speed, acceleration, rolling precision and durability.
Their configuration of 6 high-precision G10 steel balls, together with the exclusive patented Built-In Spacer XT™ system, reduces internal friction, optimises alignment within the wheel and improves energy transfer with every push.
They are a particularly recommended choice for disciplines where speed and efficiency are paramount, such as downhill, long-distance pumping (LDP), pushing, marathon skateboarding or any discipline focused on maximum speed in a straight line.
Technology developed to roll faster, Low-friction 6-Ball system
Unlike conventional 7-ball bearings, the Fullspin XT uses a system of 6 larger balls.
This configuration allows for:
- Lower total contact area
- Reduced internal friction
- Better acceleration
- Higher cruising speed
- Less energy loss
- The result is an extremely fast and efficient ride, particularly noticeable over long distances
Premium G10 steel balls
Fullspin XT bearings feature Grade G10 steel balls, one of the highest precision grades used in skate bearings.
Their manufacturing tolerances are considerably tighter than those of conventional bearings, offering:
- Greater concentricity
- Lower internal friction
- Smoother rolling
- Lower heat generation
- Longer service life
This translates into a sensation of constant speed and a more efficient response under load.
Patented Built-In Spacer XT™ system
One of the most innovative features of this bearing is its integrated Built-In Spacer XT™ system.
The spacers are incorporated into the bearing itself via a patented half-washer design with tabs providing a large contact surface.
The advantages are clear:
- Extremely precise alignment between both bearings
- Less deformation of the assembly
- Greater wheel stability
- More uniform contact with the road surface
- Better performance during braking and cornering
- More even wear on wheels and bearings
The contact area is more than double that of conventional Built-In systems, providing exceptional stability even at high speeds.
Reinforced races for maximum durability
Fullspin XT wheels use races made from high-strength steel and a thicker outer ring that increases structural rigidity by approximately 60%.
This allows for:
- Less flex under load
- A more stable ride
- Less wear on the bearings
- Better maintenance of original tolerances
- They also feature a Black Oxide surface treatment, which significantly improves corrosion resistance.
Optimised lubrication for real skateboarding
Instead of prioritising artificially long free-spinning times, Seismic uses a lubricant specifically formulated to withstand the real-world loads, vibrations and stresses of skateboarding.
This provides:
- Greater mechanical protection
- Less wear
- Consistent performance for longer
Advanced protection against dirt and contamination
The Fullspin XT features a multi-layer protection system comprising:
- Labyrinth-type outer seals
- Internal anti-contamination retainers
This design makes it difficult for dust, dirt and abrasive particles to enter, helping to maintain performance for longer even under demanding conditions.
Why doesn’t Seismic use ABEC ratings?
Seismic deliberately avoids the ABEC system because it believes it does not reflect the actual performance of a skateboard bearing.
The ABEC rating only assesses certain dimensional tolerances of the inner and outer rings, without taking into account critical factors such as:
- Ball quality
- Track finish
- Lubrication
- Retainer design
- Structural rigidity
- Assembly precision
For this reason, the Fullspin XT is designed specifically to maximise performance on tarmac, rather than to achieve a marketing-driven rating.
Key features
- Seismic Fullspin® 6-Ball Steel XT™ Built-In bearings
- Premium G10 6-ball steel system
- Lower friction and better acceleration
- Patented Built-In Spacer XT™ system
- Maximum precision alignment
- High-strength steel with reinforced raceways
- Black Oxide anti-corrosion treatment
- High-performance skate-specific lubrication
- Labyrinth-style outer seals
- Internal anti-contamination protection
- Compatible with standard 8 mm trucks
- Especially recommended for:
- Downhill
- Long Distance Pumping (LDP)
- Speed longboarding
- Pushing
- Long-distance skating
Uncompromising performance for the most demanding skaters
If you’re looking for bearings capable of delivering more speed, better acceleration, greater rolling precision and exceptional durability, the Seismic Fullspin® 6-Ball Steel XT™ Built-In are probably one of the most advanced options currently available on the market.
Designed for those seeking maximum performance on tarmac, they are the perfect complement to any setup focused on speed and efficiency.
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