Recently, riding a bicycle as sport attracts a great deal of attentions. Previous researches suggest it is ideal that pedaling in high frequency and keeping pedal rotational speed constant to perform fully. It is difficult for beginners to acquire such skill because pedaling skill of expert cyclists is developed based on long-term training. We propose a bicycle pedaling training system using auditory feedback. The system makes a feedback sound every time a pedal crank turns quarter rotation. A user can keep pedal rotation speed constant by synchronizing the feedback sounds with background music that tempo is constant. We evaluate the approach while 4 weeks, and evaluation results confirmed that the variance of subjects trained by using the system decreased significantly comparing subjects trained in conventional method.