http://www.parktool.com/blog/repair-help
http://www.parktool.com/blog/calvins-corner
http://sheldonbrown.com/diy/index.html
http://sheldonbrown.com/rinard/spocalc.htm
http://sheldonbrown.com/tire-sizing.html
http://sheldonbrown.com/sutherland.html (Tech docs for internal hubs 1960-1992)
YouTube videos
SA 3speed
https://www.youtube.com/watch?v=ea6krXSs-lc
how it works SA 3 speed
https://www.youtube.com/watch?v=o6v5K-2zWMI
How it works 5spd Std Sturmey vs.Wide-ratio version
https://www.youtube.com/watch?v=MEQ9-F3SQL8
how it works 8speed SA
https://www.youtube.com/watch?v=kJIh64i9IAY
Schlumpf 2spd
https://www.youtube.com/watch?v=aviAcrvfXo0
Sturmey Archer history/Fat tire predecessor?
https://www.youtube.com/watch?v=K3QJTTcDXJo
Raleigh Factory
https://www.youtube.com/watch?v=dqoGAXuE4eU
Nuvinci explained
https://www.youtube.com/watch?v=Smijjy832X0
CVT gear system
https://www.youtube.com/watch?v=uCEvBGT8twM
http://www.ibike.org/library/history-timeline.htm
http://www.bbinstitute.com/index.php
http://techdocs.shimano.com/techdocs/index.jsp
http://www.campagnolo.com/jsp/en/doc/doccatid_1.jsp
http://www.foxracingshox.com/help.php?m=bike&t=manuals&ref=lnav_help
http://www.foxracingshox.com/dealer_resources/?c=bike
http://www.peterwhitecycles.com/fitting.htm
http://www.weareallmechanics.com
http://www.rideyourbike.com/internalgears.shtml
http://hubstripping.wordpress.com