Abstract: A bearing assembly is provided which provides for easy trace of a wheel bearing assembly shipped from a factory, which provides for easy determination of a lot number and a lot quantity of a product including the wheel bearing assembly of interest when need arises to inspect or replace the wheel bearing assembly of interest, and which provides for quick and easy quality control of the bearing assembly. The wheel bearing assembly includes: an outer ring member (3); an inner ring member (5) disposed radially inwardly of the outer ring member (3) in concentric relation therewith; and rolling elements (6) interposed between the outer ring member (3) and the inner ring member (5). An IC chip (20) is provided at a vehicle-outer end or vehicle-inner end of the bearing assembly.

Abstract: A rolling bearing device for a wheel includes: a hub wheel including a hub spindle to be assembled with a rolling bearing, a flange formed on the hub spindle, and a bolt hole formed through the flange; a hub bolt to be press-fitted in the bolt hole, in which hub bolt includes a shank formed with a serrated shank portion to press-fitted to bite the bolt hole, an intermediate shank portion and a threaded portion in this order; and an annular ridge formed on an inner circumference of an opening on a press-fit exit side of the bolt hole. The annular ridge have a diameter smaller than that of the bolt hole and comes into contact or close to the intermediate shank portion to clog the bolt hole.