GrindKing invented the original inverted kingpin in 1988. The Disruptor continues this legacy with a washerless kingpin that is extra low in height for zero grind interfence. The integrated aluminum washer that is part of the top bushing adds more rebound response and control. A curved edge on the baseplate reduces impact stress and chance of board breakage. It is a mid-height truck that has good turning characteristics suitable for most terrain.