they're toroidal,
All rims are toroidal until they are drilled. Strictly, each rim is a solid toroid, usually with one or more non-intersecting solid toroids subtracted from the volume.
:]
@miro_o started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
All rims are toroidal until they are drilled. Strictly, each rim is a solid toroid, usually with one or more non-intersecting solid toroids subtracted from the volume.