David, an endurance athlete and author, pegged the journey the "I Got Your Six Ride," a reference to the military term for "I got your back," to raise awareness and money for Hockey Fights Cancer.
"I just wanted people to know that they're not alone," David said.
Loren was David's biggest supporter through the ride, which started on Jan. 5 in Chicago and ended on Jan. 17 in New York City. On Tuesday, Loren died at the age of 72. David estimates his dad must have watched the mini documentary chronicling the journey about 100 times.
"We talked every night during the ride and I kinda showcased that in the film," David said. "He probably encouraged me more than I did him."
Clark used a fat bike for the ride, with wide tires suited for rough terrain and weather conditions, expecting there would be some snow from Chicago to Detroit to Pittsburgh to Philadelphia to Newark to New York City. Some of the biggest challenges, however, came from freezing rain, high winds, and steep inclines and declines through the Allegheny and Blue Ridge mountain ranges.
Traffic also seemed to never end, no matter how remote the route became. He had friends following along in a van to help keep him moving steadily on the roads.