Method of manufacturing hub seal

A method of manufacturing a hub seal, the hub seal including a side lip and being designed to seal a space between an outer ring and a hub of a hub bearing, the method comprising:

• selecting, from within a designed region set in advance on a basis of a value (lip reaction force F/hub diameter D) given by dividing a reaction force F, which is a value of a reaction force of the side lip in an in-use state, by a hub diameter D, which is a value of a diameter of the hub, and a lip surface roughness R, which is a value of a surface roughness of a seal surface that is a surface of the side lip to be in contact with the hub, the lip reaction force F/hub diameter D and the lip surface roughness R, the designed region being a region of the lip reaction force F/hub diameter D and the lip surface roughness R;
• designing the hub seal such that the lip reaction force F/hub diameter D and the lip surface roughness R become the selected lip reaction force F/hub diameter D and lip surface roughness R;
• and
• manufacturing the hub seal such that the hub seal becomes the designed hub seal, wherein
• the designed region is a region included in neither torque disturbance region nor a sealing performance decrease region, the torque disturbance region being a region of the lip reaction force F/hub diameter D and the lip surface roughness R and that is set in advance on the basis of the lip reaction force F/hub diameter D and the lip surface roughness R, the sealing performance decrease region being a region of the lip reaction force F/hub diameter D and the lip surface roughness R and that is set in advance on the basis of the lip reaction force F/hub diameter D and the lip surface roughness R,
• the torque disturbance region is a region where torque disturbance is supposed to occur, and
• the sealing performance decrease region is a region where a sealing performance is supposed to decrease.