Web Resources

Bike Friday Threadless Headset Cartridge Assembly

Note: Experience has shown that using a little teflon plumbers tape on the silver conical compression ring improves the adjustability.

Internal Geared Hubs (IGH)

http://www.rodbikes.com/articles/igh-article.html - Good article comparing Rohloff with Shimano Alfine hubs

Tandem Two'sDay Folding

https://youtu.be/UcEormfKoPc - the totally awesome Tandem Two'sDay.  How-to fold.