SCIENTIFIC
https://www.exploratorium.edu/cycling/index.html A not so difficult fysics approach.
SELF POWERED
UNUSUAL HUMAN POWERED VEHICLES Lots of links!
FLEVOBIKE Recumbents.
WISIL American recumbents.
NVHPV Nederlandse Vereniging voor Human Powered Vehicles .
http://letsremake.info/PDFs/Pedal_Power_lores.pdf
SITES ON BIKE-TECH
www.sheldonbrown.com An American bike-tech site.
www.m-gineering.nl A Dutch framebuilder.
INFORMATION ON BIKE TOURS
http://www.bikeit.eclipse.co.uk/localrides/ride2/index.htm Steep hills in Engeland (180km -3800 m ).
http://www.users.waitrose.com/~ianclare/links.htm Lands End - John o'Groats
http://europafietsers.nl/fietsweb.htm Bikerides through Europa.
ONLINE BIKESHOPS
http://www.chainreactioncycles.com
http://www.ceeway.com/index.html
OTHER BIKE SITES
http://bulgier.net/pics/bike/ American framebuilder .
https://www.oldschoolracing.ch/ Swiss history on ATB's
http://www.bikeschool.com/home
https://www.wheelfanatyk.com/ Almost a religion.
http://www.cyclingpassions.eu old Tour de France magazines
http://www.nostalgic.net Old American bikes.
http://www.klassiekeracefiets.info/merkenlijst All Dutch factories and builders of racingbikes on a list.
http://www.dewielersite.net/db2/wielersite/index.php All cycleracingteams and riders
http://www.velo-retro.com/links.html
https://www.strewi-fahrradwerke.de/kataloge-schriften/ Old, mainly German, books and folders (1880-1960)
http://cyclespeugeot.web.fc2.com/reminiscencebyenglish.htm A Japanese site full of info
A collection of Daniel Rebour drawings on Flickr: https://www.flickr.com/photos/41420640@N07/with/51182124215/
Where it started: https://www.sheldonbrown.com/
http://www.equusbicycle.com/bike/index.html
https://www.disraeligears.co.uk/site/home.html
http://threespeedhub.com/catalogues/
http://www.vintage-trek.com/component_dates.htmhttp://www.sturmey-archerheritage.com/index.php
https://forum.tontonvelo.com/index.php?sid=08ebc1dfbf5425759f74de60f15cf4dfhttps://v-cc.org.uk/
https://classicjapanesebicycles.com/general-asian-serial-number-guide/
https://www.classiclightweights.co.uk/
http://bikeretrogrouch.blogspot.com/2014/08/campagnolo-portacatena-neat-idea-whose.html
https://www.frameteller.it/cataloghi/