Ogden, Utah—Only minutes into the 79-mile road race, someone in the pack moved the wrong way and about half of the 98 riders in the Division II men’s field crashed to the ground. Nate Abel’s Cervelo fork cracked. His front wheel bent like a taco. Riders scrambled to get off the pavement. Their bike jerseys were torn and blood-stained. It was a mess. “I thought I was going to stop,” said Abel, whose left eye was visibly bruised and swollen. “I squeezed my breaks, but then uh-oh.”