Racermate Challenge II is a cycling training simulation game developed by Seattle-based American company RacerMate for the Nintendo Entertainment System (NES) in the early 1990s. It works with RacerMate's CompuTrainer system, letting users connect a real bike to the NES for indoor cycling training. Players can create custom tracks and race against the computer or other players. Due to its specialized nature and high price, Racermate Challenge II was not widely sold in the mass market and had to be special-ordered through RacerMate.