Yeah, the internet is full of advice when it comes to bike fitting. Most comes from the road and TT world where the demands are similar but significantly different.

The advice I give (and followed myself) is to find one or two top level athletes that participate in the events you like and have a similar dimensions as you (e.g. short and stocky, tall and gangly, average). For example, I might choose Chris Hoy over Cav or Glaetzer as my model. Save photos and videos of them preferably from the side or front where they are square with the camera.

One good source is instagram (the athlete’s profile) another is Flickr (the photographer’s profile). It helps if you happen to choose a popular athlete.

These athletes have likely had the best fitters in the world and seen more wind tunnel time than most. This can be your target. Adjust for comfort, age, flexibility, etc.