ABA BMX
The world's largest BMX sanctioned organization. Information on the locations of the races, series standings, and information on some of the riders.
http://www.ababmx.com/
Bicycle Museum
The world's largest collection and America's most famous collection of bicycles from the Schwinn family.
http://www.bicyclemuseum.com
Bike Forums
A collection of bicycle discussion forums. -- I'd have to agree.
http://www.bikeforums.net/
CyclingForums.com
A collection of forums for cyclists and racing cyclists, all things cycling related are welcome here.
http://CyclingForums.com
Howstuffworks: Bicycles
Explains how bicycles work including information on parts, bearings, gears, and more.
http://www.howstuffworks.com/bicycle.htm
International Cycling Union (UCI)
Provides news, articles, health regulations, advocacy for road, track, mountain bike, cyclo-cross, bmx, indoor, trials, and olympics.
http://www.uci.ch/
MTB - Amputee
A site which encourages and informs both amputees and the general public in regards to prosthetic and mountain bike innovations and modifications as well as mountain biking and cycling skills.
http://www.mtb-amputee.com/
Spoke Length Formula and Wheel Lacing
Gives the formula to calculate the spoke length for any lacing pattern on any wheel.
http://www.geocities.com/spokeanwheel/links.htm
The Bicycle Store - Australia's Online & Retail Bike Shop
The Bicycle Store is Australia's biggest online bike shop. Hot deals on mountain, road, hydrid and bmx bicycles and accessories! Brand names like Trek, Gary Fisher, Lemond, Redline, and Hoffman.
http://www.bicyclestore.com.au/