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The raceway is the hardened track that a caster's swivel bearings ride in. On a kingpinless caster, it's a full-diameter ring built into the fork; on a kingpin caster, load runs through the kingpin bolt instead of a dedicated raceway.
A wider, hardened raceway spreads load across more contact points, which is the core mechanical reason kingpinless casters tolerate shock and high cycle counts better than kingpin construction.
Comes up when comparing kingpin vs. kingpinless construction, or diagnosing why a swivel section has developed play or roughness over time.
Assuming all raceways are equal. Hardening quality and raceway diameter both affect how long it holds up under repeated shock — not something you can judge by looking at a caster casually.
Can a raceway be repaired if it wears out?
Generally no — a worn or pitted raceway usually means replacing the caster, since the raceway is machined into the fork itself.
Do all kingpinless casters have the same raceway size?
No — raceway diameter scales with the caster's capacity rating; higher-capacity kingpinless casters use a larger raceway.
