A CVT comprising: a longitudinal shaft; a first disk fixedly mounted to the longitudinal shaft, rotating about a longitudinal axis and having a toroidal surface; a second disk (28, 32) rotatably mounted to the longitudinal shaft, rotating about the longitudinal axis and having a toroidal surface facing the toroidal surface of the first disk; three rollers in contact with both toroidal surfaces and defining a roller plane perpendicular to the roller rotation axis; characterized in that said CVT comprises a roller position control mechanism comprising: a spider element rotatably mounted to the longitudinal shaft, the spider element including, for each roller, a skew shaft generally parallel to the longitudinal shaft; the skew shaft defining a skew axis passing through the roller rotation axis; for each roller, a steering element so mounted to the skew shaft as to pivot about the skew axis; the steering element including a steering shaft defining a steering axis included in the roller plane; the steering axis defining an angle with the skew axis while being on the same plane; each roller being so pivotally mounted to the steering shaft as to pivot about the steering axis; a control ring interconnecting the steering elements of each roller so that they pivot about respective skew shafts simultaneously; whereby, when the steering elements are pivoted about their respective skew shafts by the control ring, the three rollers pivot about their respective steering axis so that each roller plane remains generally perpendicular to a respective radial plane passing through the respective skew axis, therefore dictating a tilt angle of the rollers with respect to the first and second disks. a longitudinal shaft; a first disk fixedly mounted to the longitudinal shaft, rotating about a longitudinal axis and having a toroidal surface; a second disk (28, 32) rotatably mounted to the longitudinal shaft, rotating about the longitudinal axis and having a toroidal surface facing the toroidal surface of the first disk; three rollers in contact with both toroidal surfaces and defining a roller plane perpendicular to the roller rotation axis; characterized in that said CVT comprises a roller position control mechanism comprising: a spider element rotatably mounted to the longitudinal shaft, the spider element including, for each roller, a skew shaft generally parallel to the longitudinal shaft; the skew shaft defining a skew axis passing through the roller rotation axis; for each roller, a steering element so mounted to the skew shaft as to pivot about the skew axis; the steering element including a steering shaft defining a steering axis included in the roller plane; the steering axis defining an angle with the skew axis while being on the same plane; each roller being so pivotally mounted to the steering shaft as to pivot about the steering axis; a control ring interconnecting the steering elements of each roller so that they pivot about respective skew shafts simultaneously; whereby, when the steering elements are pivoted about their respective skew shafts by the control ring, the three rollers pivot about their respective steering axis so that each roller plane remains generally perpendicular to a respective radial plane passing through the respective skew axis, therefore dictating a tilt angle of the rollers with respect to the first and second disks. a spider element rotatably mounted to the longitudinal shaft, the spider element including, for each roller, a skew shaft generally parallel to the longitudinal shaft; the skew shaft defining a skew axis passing through the roller rotation axis; for each roller, a steering element so mounted to the skew shaft as to pivot about the skew axis; the steering element including a steering shaft defining a steering axis included in the roller plane; the steering axis defining an angle with the skew axis while being on the same plane; each roller being so pivotally mounted to the steering shaft as to pivot about the steering axis; a control ring interconnecting the steering elements of each roller so that they pivot about respective skew shafts simultaneously; whereby, when the steering elements are pivoted about their respective skew shafts by the control ring, the three rollers pivot about their respective steering axis so that each roller plane remains generally perpendicular to a respective radial plane passing through the respective skew axis, therefore dictating a tilt angle of the rollers with respect to the first and second disks.