| 摘要 |
PURPOSE:To select an optimum number of change gear stages and to obtain an efficient bicycle driving by displaying the current speed and number of change gear stages by using the characteristic curve of optimum numbers of change gear stages versus speed. CONSTITUTION:A driver 3 is controlled according to the current speed signal of a bicycle which is generated by a speed detection sensor 1, waveform shaping circuit 2, etc., to turn on an LED4 on the characteristic curve of optimum numbers of change gear stages versus speed selectively, and the current speed and the optimum number of change gear stages are displayed on the basis of a characteristic figure. Therefore, the optimum number of change gear stages is selected easily to realize an efficient bicycle driving. |
