Hey backtome! Good for you for losing 23 pounds!
Everyone is different--but in most cases, body shape does not completely change with weight loss. I could be wrong about this--and if so, I hope some folks will correct me. I have not always been heavy, but my heavy shape is just a blown-up version of my thin shape.
You could try varying your exercise if possible--so it's not always the bike. That way you'll use different muscle groups. Toning exercise and weight training also helps a lot--for me it has been especially helpful toning my abdominal muscles.
I've gone from a size 20 to a size 16 (in some clothing). Stay with it! Keep going!
Jay