A continuously variable transmission for a bicycle comprising: input means (1100, 2100, 3100) comprising a first input flange, a second input flange and a first input shaft, at least one of the first input flange and second input flange being movable on the first input shaft so as to vary the distance between the first input flange and second input flange, output means (1300, 2300, 3300, 6300), comprising a first output flange, a second output flange and a first output shaft, at least one of the first output flange and second output flange being movable on the first output shaft so as to vary the distance between the first output flange and second output flange, and transmission means connecting the input means to the output means (1300, 2300, 3300, 6300), wherein the output means comprise output controlling means (1340, 2340, 3340, 6340) controlling a position of the output means to control a gear ratio of the continuously variable transmission, wherein the continuously variable transmission is a V-belt type continuously variable transmission, characterized in that the output controlling means (1340, 2340, 3340, 6340) comprise output elastic means, an output plate (1341, 2341, 3341) fixed with respect to the first output shaft, output actuating means, and a case fixed with respect to the at least one of the first output flange and second output flange that is movable on the first output shaft, wherein the output elastic means is positioned between the output plate (1341, 2341, 3341) and the at least one of the first output flange and second output flange that is movable on the first output shaft to bias the position of the output means (1300, 2300, 3300, 6300) toward a lower gear position, and wherein the output actuating means comprise weights positioned between the output plate (1341, 2341, 3341) and the case to actuate the position of the output means toward a higher gear position by means of centrifugal force when the speed of the output means (1300, 2300, 3300, 6300) increases. input means (1100, 2100, 3100) comprising a first input flange, a second input flange and a first input shaft, at least one of the first input flange and second input flange being movable on the first input shaft so as to vary the distance between the first input flange and second input flange, output means (1300, 2300, 3300, 6300), comprising a first output flange, a second output flange and a first output shaft, at least one of the first output flange and second output flange being movable on the first output shaft so as to vary the distance between the first output flange and second output flange, and transmission means connecting the input means to the output means (1300, 2300, 3300, 6300), wherein the output means comprise output controlling means (1340, 2340, 3340, 6340) controlling a position of the output means to control a gear ratio of the continuously variable transmission, wherein the continuously variable transmission is a V-belt type continuously variable transmission, characterized in that the output controlling means (1340, 2340, 3340, 6340) comprise output elastic means, an output plate (1341, 2341, 3341) fixed with respect to the first output shaft, output actuating means, and a case fixed with respect to the at least one of the first output flange and second output flange that is movable on the first output shaft, wherein the output elastic means is positioned between the output plate (1341, 2341, 3341) and the at least one of the first output flange and second output flange that is movable on the first output shaft to bias the position of the output means (1300, 2300, 3300, 6300) toward a lower gear position, and wherein the output actuating means comprise weights positioned between the output plate (1341, 2341, 3341) and the case to actuate the position of the output means toward a higher gear position by means of centrifugal force when the speed of the output means (1300, 2300, 3300, 6300) increases.