There is a thread one weightloss and I posted this a while back: Your personal best way to lose some fat - anecdotes / experiences / examples of what kicked your *** - #271 by Dubadai
Might be relevant for your question 
But either way, for a sport like cycling, carbs and protein are to prefer. You will naturally get some fats in, but try to keep these to natural fats, such as olive oil, avocado etc.
I eat a high af carb diet, lots of protein, and very little fat, and it keep my weight the same. Losing weight is the hard part and requires some measuring to make sure you’re still getting in the right nutrients.
Easy question to get you started, how much are you training now and are you eating to fuel that, or are you having cake and candy, soda etc. also? If so, start by cutting that out and see what happens