Abstract: A bicycle wheel assembly prepared by a process comprising the steps of:(a) Inserting a bicycle rim assembly comprising a central hub, a plurality of radially extending spokes joined to said hub at one end and a rim having a channular cross section joined to the opposed ends of the spokes into a mold cavity configured to form a bicycle tire around the rim;(b) Injecting a foamable polyurethane composition into said mold cavity;(c) Foaming and curing the polyurethane composition in the mold cavity; and(d) Cooling the so-foamed polyurethane composition to cause it to shrink fit around the rim.