Don't get your hopes up, it's a black screen the whole time.
The sound is originally mixed to be played on a 5.1 speaker surroundsound system. Assuming most people are listening through computer speakers or headphones, sound is compressed into stereo, but not remixed specifically for stereo listening.
Sound recorded via microphones on the riders and contact microphones attached to the downtubes of the bikes.
Orbea Orca Gold Series Carbon bike
Orbea Aqua Dama Aluminum bike
Recorded in 2011