Seismic Fullspin Skate Bearings with Built-in Spacers (Skateboard bearing spacing only)
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).
Most items are instock but occasionally they are not. You can always check before placing the order.
Due to high demand, occasionally some of our products do go out of stock. We are constantly monitoring our stock levels, and we usually expect to replenish any product line within a couple of weeks. If you have placed a order for an item that is out of stock and it looks like it will take longer than expected to get it to you.
