LEGO Outdoor RC was a subtheme of Racers that consisted of four sets, the first set introduced in 2004 and the remainder sates were available in 2006. The theme contained RC LEGO cars that could be controlled by a wireless radio remote control unit. While the vehicles were compatible with TECHNIC, most of the pieces were proprietary to the specific models including the sets wheels.
2004 LEGO Sets
2004 was a shakeup year at LEGO, coming off of 2003 with record losses. Some significant events include the release of the QUATRO System for very young children, and most notably the replacement of many long-standing LEGO colors including gray, dark gray, brown and violet and the introduction of some new colors like light nougat which ultimately became the skin tone for many minifigures. In 2004, The LEGO Group created a partnership with Ferrari and a number of LEGO Ferrari sets were released that year based on Ferrari’s Formula 1 racing cars. New themes released in 2004 included Maersk, Knight's Kingdom II and Ferrari under the Racers theme. LEGO discontinued the Adventurers Orient Expedition, the original Spider-Man theme, LEGO World City and Gravity Games.