A tire wheel bearing apparatus comprises an outer member having multi rows
of track surfaces integrally provided on an inner periphery, an inner
member having a tire wheel mounting flange provided at one end thereof, a
cylindrical small diameter step portion provided at another end thereof
and double-rows of track surfaces formed on the inner wheels force fitted
to the small diameter step portion so as to oppose to the track surfaces
of the outer member, and double-rows of rolling elements respectively
interposed between the track surfaces in the outer member and the inner
member, the inner wheels being fixed to the inner member by radially
outwardly caulking the end portion of the small diameter step portion of
the inner member, the track surfaces in the outer member and the inner
member and the rolling elements has a contact angle with a bearing
clearance being set to be negative.
