the number of gears for the number of front gears display 56 is performed the setting method is the same as that used for the number of rear gears display 55 the set numbers of gears are stored in the memory 22 and the data regarding the numbers of gears is maintained until the default values are set once more when all initial settings have been entered the right hand mode button 20 a and the left hand mode button 20 b are pressed simultaneously once more and the display apparatus 15 enters normal mode if the right hand mode button 20 a and the left hand mode button 20 b are pressed simultaneously for three seconds or longer the liquid crystal display 25 is initialized and the cpu 21 can be reset as well by pressing the right hand mode button 20 b for three seconds or longer the gear shift mode can be switched between automatic mode and manual mode when manual mode is selected u2018 mt u2019 is displayed in the contents display 54 while u2018 at u2019 is displayed if automatic mode is selected with regard to the external gear shift mechanisms 8 and 9 the relative sizes of the oval symbols in the graphic display in the number of rear gears display 55 and number of front gears display 56 may be arranged so as to correspond to the effective diameters of the gears as described above but where the bicycle is using internal gear shift mechanisms the relative sizes of the oval symbols of the graphic display in the number of rear gears display 55 and the number of front gears.