2.75 Kingpin.
Surf-Rodz Grind Kingpins allow the rider to eliminate the use of a flat washer between the bushing and the head of the kingpin itself; this, combined with the flattened and rounded head of the kingpin makes for extra hanger clearance. In other words, say GOOD-BYE to grinding off the top of your kingpins, and HELLO to smooth grinds - a kingpin that will last.
 
Works best with our RKP and HYBRIDSZ trucks.