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robert-brown | 3 years ago
Good quality skates have pivot pins whose length is adjustable. I don't know if skateboard trucks generally have this feature.
You tighten and loosen the pressure on the kingpin rubber bushings by shortening and lengthening the kingpin in order to adjust resistance for cornering. When you do that, you also need to be able to adjust the length of the pivot pin. Otherwise, lengthening the kingpin results in a pivot pin that's not resting properly in its cup. You want it just touching, not floating out of the cup or exerting a lot of pressure on the cup.
robert-brown|3 years ago
Good quality roller skate truck pivot pins end in a spherical ball and the pivot pin cup on the truck is also spherically machined. There's no bushing in the cup.
bze12|3 years ago