Abstract: An improved bicycle rim and wheel having good aerodynamic properties and good crosswind stability is provided. In one embodiment, a toroidal rim is utilized to reduce the drag component normally associated with a conventional spoked wheel. The toroidal rim has a streamlined inner rim surface and a tire mounting surface. In other embodiments, drag reducing spoke systems are used in conjunction with a toroidal rim to lower wheel drag. In the preferred embodiments, the toroidal rim and wheel attached thereto form a transverse cross section which is substantially elliptical and has a high aspect ratio. The maximum rim width can be wider than the tire to achieve good aerodynamic efficiency.