I watch Global Cycling Network sometimes. It gives you latest updates on all upcoming events in addition to enhancing your knowledge through instructional videos which includes videos on bicycle riding, maintenance and tech news, how-to videos, and news updates. The channel also features interviews of professional cyclists which are very motivating and coverage of international professional cycling events.
I like to watch Redbull Bikes, they have insane videos. Redbull choose and sponsor top class athletes, most of them perform mind blowing stunts. I also follow X games in YouTube,
Francis Cade, channel is good. He is funny and love the way he explores cycling culture all over the world. Good channel to watch and learn about biking.
I follow the cycling channel which provides you 24/7 amateur cycling. Here you can watch bikers live with races going on in USA and Europe. Together with Norcal Cycling, this channel covers strategy, technique, equipment, nutrition which I find extremely interesting.