"The Rider" is a classic in that genre, and I have it in my cycling library.

I used to suffer greatly as a competitive runner, but I no longer suffer as a competitive cyclist. I love being on the bike so much, that I am able to put my suffering aside. Recently, I ran a TT competition averaging 97% of my max heart rate. There was more than enough pain there if I were to allow it to impinge upon my consciousness. Instead, I forced myself to think of my grip on the aerobars (I would be clenching it), and then relaxing my hands. I would then work through my body relaxing the parts, I would think of my pedal stroke checking to see if it was as efficient as it could be, I would see the road flying by, and allow the clapping of the spectators to enter my consciousness, and finally, I would picture myself on the podium in first place. I found that by replaying this sequence, I felt nothing but elation, and not until I let out a resounding retch (I am told that it frightened a police officer who thought I was having difficulty breathing as I whizzed by) at the end did I finally acknowledge the pain I had apparently suffered.