While he set fast time in practice, he crashed out of competition after leading early. Redeeming himself, he defeated English Champion Charles Collier at the famous Brooklands oval speedway in a match race just a few days later. At the Brooklands (England) races of July 8 he was recorded at 87 mph (The MotorCycle July 13, 1911). At Brooklands on August 5, 1911 he broke the outright speed record (held by Henri Cissac since July 1905) when he covered a flying kilo in 25.2 seconds equal to 88.77 mph. He was riding his well known 7 hp Indian racer "No 21". (The MotorCycle August 10, 1911). After DeRosier returned from England in 1911, he had an argument with company founder George Hendee and was fired from Indian. He was immediately hired by Excelsior Motorcycles. He then set a kilometer speed record for Excelsior at 94 mph. While Jake DeRosier was widely respected for his skills at the wheel of a motorcycle, he spent much of his career injured in spectacular accidents. He broke his left leg three times, his left forearm once, had one rib removed, fractured his skull, severed an artery and suffered serious leg burns from flaming engines. He suffered the most serious injuries of his career on March 12, 1912. Injuries to his left leg and thigh were extensive. He endured three corrective surgeries, losing his life to complications from the final operation on February 25, 1913.