Perry Kramer (born October 6, 1959 in Santa Monica, California U.S.) is a former American "Old School" professional Bicycle Motocross (BMX) racer whose prime competitive years were from 1974-1981. Among his accomplishments is his co-founding with Scot Breithaupt of Scot Enterprise Racing (SE Racing). His nickname "PK" is a simple derivation from his first and last initials of his name and the inspiration of one of the most popular models of BMX bicycle, the "PK Ripper", that is still in production.