I am the opposite. I have always been in pretty good shape. Have weighed the same for 20 years. I am maybe 10-20 pounds over ideal for my bodyweight, yet the various doctors I have seen over the years think I am nuts when I tell them I could stand losing a few pounds (I definitely could lose 10-15 and not be skinny).
Last 2 years plus I have worked out harder than ever before. Spinning classes almost every day in the off season, 2-3+ hour bike rides almost every day during the road season (I boot it pretty good too).
Went away for a few weeks and could not bike , instead I found an Olympic sized pool and swam an hour a day (all front crawl) with no stopping or resting.
I do not drink any alcohol these days because it triggers migraines. Cutting out booze is supposed to be great for losing weight.
I eat healthy food only.
I have not lost a single pound.
I feel better than I ever have, I enjoy my workouts more now that I am better shape, my body shape has changed a bit (maybe less flab about the middle).
I know that if I really wanted to take off those 10-15 pounds I would have to restrict food intake and count calories.
Enjoy your new biking career and my suggestoin would be to focus on your workouts (frequency, duration, intensity) and don't worry too much about the scale. Many people lose weight quickly when they start working out, then level off or even gain some back, then get really discouraged.
After awhile it's all about the endorphines, not the scale.
My 2 cents