Nineteen-year-old Brock Johnson of Santa Cruz, California has broken the world record for “bike surfing.”Bike surfing is a popular BMX stunt where a cyclist balances one foot on a bike’s handlebars, and another on the seat. The record for distance traveled while bike surfing was 80 meters. Friday afternoon, Johnson attempted to bike surf 100 meters. Johnson describes himself as a professional stunt rider. He is a member of the Santa Cruz Maniacs bike crew — all of whom were positive Johnson would break the record.Phoenix Campbell, a fellow cyclist, tells stories of Johnson bike surfing down “Miramar Death Hill” just six months after attempting the stunt for the first time. The hill is the biggest in Santa Cruz for stunt riding, and Johnson biked and surfed the full length.”I’ve seen him surf on his bike for 20 minutes straight, just pumping around,” Campbell said. “We’ve seen guys who claim …