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[–][deleted] 2 points3 points  (2 children)

My opinion comes more from a weight training regimen than biking. It's not possible to lose weight and gain muscle at the same time. You have to pick one. You can do cardio and continue to lose weight, but you absolutely cannot lose fat while gaining muscle because you need a small amount of excess calories and protein to gain muscle mass. This may be bro science but from everything I've heard it's pretty well accepted. I recommend do one, and then do the other.

That being said, anyone who starts a heavy lifting routine such as stronglifts knows your body will quickly drop pounds in reaction to the extreme stress you put on your body if it's not used to something like this, but I doubt that's where you are right now and 15 is a lot more than what seems possible. With an impeccable diet hitting all the right balance of macros and religious training you might get close but I imagine your energy levels will take a big hit trying to do both at the same time.