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Swivel lead (also called trail) is the horizontal offset between a caster's swivel axis (where it pivots) and the wheel's actual contact point on the floor. That offset is what makes a caster self-align and trail behind the direction of push.
More lead generally makes a caster swivel more easily and self-align faster, but increases the overall footprint. Too little lead and a caster can be sluggish to swivel or even flutter at speed.
Matters most for fast-moving or frequently-repositioned carts, where swivel responsiveness affects how easy the equipment is to steer.
Ignoring lead when replacing a caster. Swapping to a caster with significantly different swivel lead changes how the whole cart handles, even if capacity and wheel size match.
Is swivel lead the same as swivel radius?
No — swivel radius is the full footprint the caster needs to rotate; swivel lead is the specific offset that makes it self-align.
Does more swivel lead mean better performance?
Not universally — more lead generally improves self-alignment but takes up more space and can feel less stable at high speed.
