| abstract |
A grease composition capable of maintaining the performance required for a rolling bearing unit for supporting a wheel while maintaining the load sensitivity of rotational torque and maintaining a good lubrication state for a long time, and for supporting a wheel in which the grease composition is enclosed. A rolling bearing unit is provided. A base oil, a thickener, a rust inhibitor, and an antiwear agent are contained, and the base oil is a mineral oil, a synthetic oil or a mixed oil thereof, and the mineral oil and the synthetic oil are mixed. Grease having a mixing ratio (mass ratio) of 0: 100 to 20:80, a kinematic viscosity at 40 ° C. of the base oil of 70 to 150 mm 2 / s, and a pour point of the base oil of −40 ° C. or less. A wheel bearing rolling bearing unit in which the composition and the grease composition are enclosed. [Selection figure] None |