# Seismic - Fullspin™ 6-Ball Steel XT™ Built-In

**Fullspin™ 6-Ball Steel XT™ Bearings with Patented High-Precision Built-In Spacer System  
**Next-level skate bearing tech – _more speed, better handling, longer life!_  
_Fit standard 8mm axles only._

We spent over two years nerding out with a crack team of American engineers from one of the biggest and best bearing factories in the world, to raise the bar on bearing tech _yet again_! Roll tighter, truer, faster, and smarter on **Fullspin:** _the absolute best skate bearings in the entire history of skate bearings!_

**THE BASICS** _(Scroll down for more in-depth technical info.)_**6-Ball system** _–_ Less total friction, better acceleration and speed on straightaways. Recommended for LDP and top-speed pursuits.  
**Premium Steel balls** – Superior Grade G10 balls spin truer with less friction inside bearings.  
**Exceptionally tight, consistent assembly and raceway tolerances** – Significantly less internal play, friction, wear, and noise. _Superior speed, handling, and durability._  
**Extra-tough steel** **and thicker outer rings** _–_ Raceways hold strictest curvature and finest surface finish – and _bearings stay tight and fast_ – for far longer. Thicker, _60%-stiffer_ outer rings resist flexing, _spin truer and faster_, and keep seals from popping off on extreme impacts. Premium black oxide surface treatment adds exceptional corrosion resistance.  
**Next-level patented Built-In spacing / alignment system –** Built-in half-spacers with _extra-wide flanged ends_**\*** square up inside wheels with _more than double the contact area_ of ordinary Built-In interfaces – powering _absolutely unparalleled alignment precision and stability_. System 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.  
**High-end lubricant** – Formulated for _peak performance under real-world skating stresses_ (not max free-spin time).  
**Labyrinth-style outer seals** – Edges of seals slot inside V-shaped grooves for maximum resistance to dust and debris.  
**Next-level anti-contaminant ball retainers** – Expanded outer diameter slots into groove in outer ring just like a second seal, to form a _unique integral barrier against dirt and grime_.

**\*** _**Note:**_ Flanged half-spacer ends may not fit into hub-less street wheels with extra-thick urethane bearing supports. Choose Fullspin Classic or Fullspin LITE Built-In bearings for wheels of this kind.

## Details

- **Price:** 368.0 HKD
- **Vendor:** Seismic
- **Type:** Bearings
- **Tags:** bearings, Seismic, Steel

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 368.00 HKD | In stock |

## Images

- Seismic - Fullspin™ 6-Ball Steel XT™ Built-In
- Seismic - Fullspin™ 6-Ball Steel XT™ Built-In
- Seismic - Fullspin™ 6-Ball Steel XT™ Built-In
- Seismic - Fullspin™ 6-Ball Steel XT™ Built-In

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> Source: [SBDW Longboards Hong Kong](https://sbdwlongboards.com/products/seismic-fullspin-6-ball-steel-xt-built-in)
> Updated: 2026-04-20