For this reason, most are built from Baltic Pine which often comes from a plantation in Finland that has supplied virtually every recently built velodrome. A 250 metre track has 60km of 40mm x 40mm x 6m planks and is held together by 360,000 nails. Offices are usually underground, but the Atlanta track was temporary so no no underground facilities were dug. The Atlanta track was sold after the 1996 Games and is now part of Los Angeles Disneyland. Bikes and Equipment Track bikes are minimalist.
Speed is controlled by pedalling and by pushing back on the moving pedals.
Pursuit bikes are the exotic carbon wheeled fish everyone gets excited about. Disc wheels are used for aerodynamic reasons even though they are heavier, weaker and far more expensive than wire spoked wheels. Front discs are only used indoors as the slightest breeze sends a bike with one blowing up the track. Three and four spoke wheels have most of the aerodynamic advantages of discs without the problem of instability in a sidewind and are therefore commonly used up front. Track bikes use one-piece tyre and tube assemblies called 'tubulars' or 'singles' that are glued on to the rim.