Jason McElwain -- the former basketball manager who went viral in 2006 after suiting up and scoring 20 points in a high school game -- broke nine ribs in a serious bicycle accident Monday afternoon ... but luckily, he was wearing a helmet, and is expected to make a full recovery.
According to USA Today, police in Greece, New York responded to a call of "a bicyclist who made contact with a motor vehicle."
The 34-year-old was transported to an area hospital ... where he was treated for non-life-threatening injuries.