The present invention relates to the front and the rear wheel power transmission device of a bicycle, the front wheel and the rear wheel is pre-entered into each of the front and rear wheel fixed shaft (6b, 6a) rear wheels fixed shaft (6a) fastening the fixed rear-wheel power gear integral to the left of ( 10) the rear end wire cable so that the first connection of the one side gear to a rotating power shaft 31 is connected and coupled rotatably gear has rotated the wire cable 90, the rear-wheel power cross-transmission rotary shaft 36 of the other side (91 ) is entered into the rear wheel power gear 10, rotational power to the wire cable (with the rear wheel drive transmission member 30 that transmits to 90), the fastening integrally with a right side of the front fixing of the front wheel shaft (6b) fixed front wheel power of to the gear 60 the rotational power shaft second connecting gear 81, the wire cable, a front end portion such that the rotating wire cable (90) is rotatably to the gear connection coupling and the rotary shaft 86, the front wheel power cross-transmission of the other side of the one side 96 is related to the front and the rear wheel power transmission device of a bicycle characterized in that configured to include a front wheel drive transmission member 80 for transmitting the fastening is a front wheel power gear wire cable to the rotational power of 60 (90).
Thus, a simple structure that is easy removable for the wire cable (90) at both ends of the rear-wheel power to the rear wheel power transmission member 30 and the front wheel drive transmission member 80 rotatably coupled to the gear 10 and the front-wheel power gear 60 since there is an effect that can be produced while minimizing the cost maximize the driving performance.