Maintenance

Ask the Mechanic - Andy the Mechanic, AKA Andy Wallen, fields technical and bicycle fix-it questions.
http://www.bikexchange.com/askmech.htm

Bicycling Maintenance & Technical Books - Repair, maintenance, frame and wheel building.
http://peteandedbooks.com/7.htm

Bicycle Maintenance Guide and Riding Tips - Contains maintenance tips and tutorials categorized by topic.
http://me.in-berlin.de/~bitrot/bbook_intro.html

Bicycle Maintenance Guide - Summary of what an experienced cyclist has learned over the years.
http://www.bitrot.de/bbook_intro.html

CyberCycle - Repair Shop Notes
http://library.thinkquest.org/10333/repairs/index.html

GeRZ Bicycle Gear Tables - Learn to check and evaluate bicycle gear ratios to improve the efficiency of your road or off-road bike -- includes both 27" and 26" gear charts.
http://home.i1.net/~dwolfe/gerz/howto1.html

FAQ from rec.bicycles.tech - "Frequently Asked Questions" list from the rec.bicycles.tech newsgroup. Valuable answers that give more details than most sources.
http://draco.acs.uci.edu/rbfaq/FAQ/index.html

HPV Drivetrain Analyzer - Drivetrain evaluator for bicycles, tricycles and other HPV's that use chains, sprockets, geared cranks and hubs with 1:1 power transfer to environment, ie wheels rather than screws.
http://www.soulbikes.com/gears/

Home made cheap bright light - Detail of my experience making a 20W 12V 20 degree headlight for my bicycle commute.
http://www.geocities.com/jimburnetto/bike_light.html

BikeWebSite - Step-by-step guides for bicycle tune-up and repair. A comprehensive, illustrated, online bicycle repair manual.
http://www.bikewebsite.com/

ProMechanics.com - USA Cycling's advisory board for bicycle mechanics provides this site on how to become or locate professional race mechanics. Also, includes resources for the mechanic.
http://www.promechanics.com/

Sturmey Archer SW Hubs - Hints and tips for maintenance and repair of the "silent" Sturmey Archer hub.
http://my.ohio.voyager.net/~bdhayes/sa/sw.htm

BikeForums.net: Bicycle Mechanics - Topics include bicycle maintenance, repair and common issues and fixes.
http://www.bikeforums.net/forumdisplay.php?forumid=10

Chain-Suck in a Nutshell - Chain-Suck binds chains onto the teeth of chain-rings, and brings pedalling to an abrupt stop. Find out why, and how to resolve the problem.
http://www.fagan.co.za/Bikes/Csuck/CHAINSUCK.htm

Mountain Bike Repair - Step-by-step bike tuneup and repair with color photos.
http://www.utahmountainbiking.com/fix/