three things works for me:
1- counting EVERY calorie and logging it
2- watching everything that goes into my mouth. I dont tell myself I cant have it, I just need to be thoughtful and if I want something indulgent, I know that I will need to make it up a little in the gym
3- body and muscel confusion: I dont just ride, I hit the gym for other cardio like tredmil, eliptical or a workout class. I went to a step n jam class last week and it KILLED me.
Again, this is only what is working for you. Most of the time, it is the ability and need to watch what you are eating and getting quality calories in.
I also use the bodybugg to help me and it has been amazing.