Each wheel takes 2 bearings (so a full set = 8 bearings)
Made of steel or ceramic
Consist of balls between two metal rings (races), held together by a cage, and sometimes protected by shields
ABEC = "Annular Bearing Engineers Committee"
It measures tolerances — how precisely the bearing is manufactured
ABEC levels: 1, 3, 5, 7, 9 (higher = more precision)
ABEC ratings don’t fully apply to skateboarding
They’re made for machines, not skating
Doesn’t factor in impact strength, side loading, or dirt resistance
An ABEC 7 may spin smoother in a lab, but not necessarily better for skating than an ABEC 5 made for street abuse
Most common and affordable
Good for street, park, beginner setups
Decent speed, but wear out faster than higher-end types
Precision-made (not just the name)
Super smooth, fast, and durable
Often use better materials and design, not necessarily Swiss-made
Great for transition, vert, or serious street skating
Bones Swiss or Super Swiss 6 are top-tier here
Use ceramic balls (instead of steel)
Lighter, stronger, heat-resistant, don't rust
Spin faster and longer
Very expensive
Great for speed and long-distance, but overkill for everyday street tricks
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