David "Tinker" Juarez (born March 4, 1961) is an American former professional BMX and cross-country mountain bike racer. His prime competitive years in BMX were from 1978 to 1984 and in mountain bike racing 1986 to 2005. Since late 2005, he has competed as a Marathon mountain bike racer. In all three disciplines, he has won numerous national and international competitions. Most recently, Juarez finished third in the 2006 Race Across America Endurance bicycle race.

Born in Downey, California, Juarez is a highly talented cyclist who has made significant impacts in the cycling disciplines of BMX Racing, Freestyle BMX, Cross-country Mountain Bike racing, and now Marathon Mountain Bike racing for over thirty years. While he was also known as the "Hollified Flash" after one of his home BMX tracks he used to race at and dominate in the early-1970s, the moniker "Tinker" is a nickname that was coined by his family. According to his Mother Rose: "We used to say 'Stinker' when he was a baby, everybody thought we were saying 'Tinker" David Juarez is so well known by his nickname "Tinker" many people probably think that is his real first name.