Versatile Free-Spacer System:Precisely-sized spacers square up against bearings and stabilize them inside wheels. Combines withTighter Radial Tolerances(3µ – 5µ) that minimize torsional play inside bearing assemblies. Locks inhighly-precise alignment, protects against friction and wear, minimizes noise.
XT Construction:More than 50% tougher!Superior steel, thicker outer casings, and advanced heat treatment. Ball raceways hold smooth polish, and bearings stay tight and fast,for far longer! 50%-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.
Advanced Dust-Resistant Ball Retainers:Keep bearings cleaner for longer, without the added friction of a second seal. Formed of Dupont® engineering-grade Nylon.
High-End Lubricant:Packed with premium “high-RPM” light grease from Kyodo Japan. Formulated forpeak performance under actual skating stresses,notmax free-spin time.
Inner Race:Specially contoured under seal to resist contamination.