| 摘要 |
PURPOSE:To facilitate attachment and removal of a tire and improve braking force by differentiating bead seat diameters of a wheel at the inner and outer sides of a vehicle body and fitting bead portions having different diameters respectively to said bead seats to be seated pivotably sideways of the vehicle body. CONSTITUTION:Diameter D1 of a bead seat 6 inside a vehicle body is formed larger than diameter D2 of the bead seat 7 outside the vehicle body, to which bead seats are respectively fitted bead portions 8, 9. In this construction, when a tire 3 is attached, the inside bead portion 8 corresponds to the outside bead seat portion 7 of a wheel 2 and then the tire 3 is forced into the inside to fit the inside bead 8 to the inside bead seat 6 while fitting the outside bead 9 to the outside bead seat 7. Because of such difference between diameters the tire 3 can be easily attached and removed. Also, since the diameter of the inside bead seat 6 is larger the diameter of a brake drum 10 can be enlarged to improve braking force. |
