Oversized Bearings:
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Outer bearings are 6x15x5mm (stock is 6x12x4mm).
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Inner bearings are 12x21x5mm (stock is 12x18x4mm).
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Wider bearings create an additional 2mm of contact with the axle for smoother, longer running performance.
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3mm. larger bearings have balls a full 33% larger than stock!
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The load ratings of RPM oversized bearings are double that of stock bearings and more than triple the fatigue rating of stock bearings as well!