Biking through Chinatown. When Andy and I went to Griffith Park, I reached my personal best record speed on this bike at 43.6 mph. I beat my last record of 42 mph. My all time personal best record is still at 48 mph. I reached that speed going downhill on Gennessee in San Diego on my way to La Jolla. It was a long straight downhill where I could reach that speed. My bike kinda started getting unstable though going that fast. It was kinda scary. This was on my mountain bike too, the Parkpre (Park Precision) Sledgehammer.