Abstract: The invention concerns a pedal assembly bearing or hub bearing for a bicycle. The inventive assembly comprises two antifriction bearings mutually spaced apart and capable of being arranged in a housing of a pedal assembly bearing or wheel bearing of the bicycle. Each antifriction bearing comprises an inner ring having a raceway for the rolling elements, as well as an outer ring having a raceway for the rolling elements, the rolling elements being placed between their respective raceways of the inner ring or of the outer ring. To achieve a high bearing surface while providing for low production costs. Therefore, the inner ring and the outer ring of the two bearings are both produced as compact elements, the outer ring having a tubular shape. An antifriction bearing is produced as roller bearing while the other antifriction bearing is produced as cylindrical roller bearing.

Abstract: The fixing device is intended for a roller of the type comprising a pulley mounted on a rolling-bearing device comprising a row of rolling elements arranged between a ball race provided on an outer ring integral with the pulley and a ball race provided on an inner ring. The device comprises a screw comprising a cylindrical rod and, at one end of the cylindrical rod, a head provided with a rotary-drive. The device comprises a sleeve arranged on the screw, said sleeve comprising a gripping surface for fixing on the inner ring of the rolling bearing and leaktight seal interacting with a turning part of the roller.

Abstract: The combination comprising, a bearing housed in a belt pulley, a sealing disk covering the bearing clamped between the head of a screw and the inner ring of the roller bearing, means attaching said sealing disk 4 directly to the inner ring axially and radially and including projections 13, 14 extending into the bore of the inner ring to secure the screw 3 for transport.