Full disclosure: what follows is Seismic‘s own text for these bearings. We’ve just copy and pasted it because… well… there’s a lot of text here. All we’ll add is that, yes, these bearings are bloody good.
- Precision Alignment
- 30% Stronger Steel Casings
- Tighter Assembly Tolerances
- Premium Lube
– More speed & acceleration
– Consistent wheel contact & grip
– Predictable slide release & hookup
– Extended wheel & bearing life
Built-in Spacing System: Integral half-spacers end in broad, flat contact surfaces that square up and self-stabilize inside wheels – correcting for flaws in bearing seat levelness, bearing seat spacing, axle diameter, and axle straightness. Combines with Tighter Radial Tolerances (3µ – 5µ) that minimize torsional play inside bearing assemblies. Locks in highly-precise alignment, protects against friction and wear, minimizes noise.
Tougher Construction: Superior steel and thicker outer casings boost strength by more than 30%! Ball raceways hold smooth polish, and bearings stay tight and fast, for far longer! 30%-stiffer casings resist flexing, spin truer / faster, keep seals from popping off on extreme impacts.
7-Ball Assembly: Classic configuration. Best overall durability against frequent high impacts and side loads.
Premium Steel Balls: Superior concentricity, surface smoothness, strength, and durability.
High-End Lubricant: Packed with premium “high-RPM” light grease from Kyodo Japan. Formulated for peak performance under actual skating stresses, not max free-spin time.
Inner Race: Specially contoured under seal to resist contamination, and stepped between bearing body and flange to save weight. Extends 0.5mm outside to form built-in washer. No bearing spacers or axle washers required!
Additional Features: Dupont® engineering-grade Nylon retainers, removable rubber-coated steel seals with printed graphic.
Meets or exceeds all criteria for ABEC-9 rating.