Patent ID: 8721008

Claim:
A hub device for a bicycle for supporting a rotary motion of a wheel, comprising: a hub case which is attached to a center portion of the wheel for receiving a load exerted from a rim to which a tire is fitted via a spoke, and the hub case having each inner diameter of end portion larger than a diameter of a center portion; a sleeve integrally attached to the hub case at a side of the inner diameter of the hub case, which serves to transfer the load exerted on the hub case to a shaft, wherein the shaft rotatably supports, via a bearing, a whole structure of the wheel, which includes the sleeve and the hub case, wherein the sleeve is a cylindrical member and a plurality of predetermined slits are disposed around both end portions of the cylindrical member in a circumferential direction, and wherein the bearing receives the load exerted to the sleeve and rotatably the whole structure of the wheel.