What are the materials used in a JITENSHA?Updated a year ago

JITENSHA frames and forks are made of an alloy called "chromoly steel", better known as "Cr-Mo 4130". Double butted means that the thickness of the tube varies: thicker at the joints to increase strength and thinner on other sections to reduce weight. 

The result: a good balance between lightness and durability. Cr-Mo also offers greater flexibility than steel or aluminum, with better vibration absorption. Carbon and aluminum are lighter, but more brittle and stiffer.

All other parts are made of 6061 aluminum alloy (i.e. crankset, handlebars, seat tubes, etc.), aluminum (rims, pedals, etc.) and microfiber (handlebars, saddles, etc.).