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Anatomy of a Randal Truck
Axle. This holds the bearings, which hold the wheels.
Axle offset/rake - This describes the axle’s position compared to the pivot axis. This is also referred to as the
Caster Angle.
Axle travel - This is the path the axle takes when it rotates on the pivot axis.
Baseplate - This bolts to the board, it in turn holds the kingpin and pivot-cup.
Bottom bushing - Made from polyurethane, it helps hold the hanger in place and control turning. The bottom bushing also takes rider weight.
Bushing seat - This part of the hanger is shaped to help the bushings keep the hanger in the right place.
Caster - Positive Caster is the tendency for the truck to stay centered. Negative Caster is the tendency of the truck to stay in a turn. This is determined by the axle offset being either above or below the axle.
Cup washer - These help push the bushings into the hanger’s bushing-seat. The cup shape also helps control the shape of the bushing’s distortion when the hanger turns.
Hanger - The hanger holds the axle, the bushings and has a pivot. It’s width controls the distance between the truck’s wheels.
Kingpin - This bolt holds the truck together as one unit. How tight it is affects how the board turns.
Pivot - Part of the hanger, it helps hold the hanger in place, as well as constrain it’s motion to the pivot axis.
Pivot-axis - This is what the hanger rotates around when it turns.
Pivot-cup - Made from hard polyurethane, it holds the pivot in the correct position.
Roll-axis - This line is what the board rotates around when it leans.
Roll center - Defined by where a line, square with the board, crosses both the axle’s center, and the pivot axis. A line between these points on both trucks defines the roll axis.
Top bushing - Made from polyurethane, it helps hold the hanger in place and control turning.
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