Tony answered it well. We will not all respond equally (in performance gains and how the body changes in appearance) with the same stimulus or stressor. Your legs may have indeed added some size, but what is incredible about the human body is its unique ability to adapt to the stressor even if the end result is that we take on a different appearance.
Regardless of how your legs are currently responding or adapting to the stressor try to ignore that aspect and focus in on sports specific training. If your leg muscularity is currently increasing just forget that aspect and let them adapt and change shape as training continues. Please trust me as a former strength consultant and competitor that gym training is not the answer and will probably end up hurting your cycling training more than helping.
I am a big believer in sports specific training and evidence/science based training, but there are times when faith based training is crucial. Faith based training in my terms is when you don't quite understand what is going on or what you need to do or when you start second guessing the program or sport specific stressors is that you have faith in those that are well versed like Dave, RDO, Alex, Coggan and a few others. Wisdom based is when you can see through some of the [censored] posts that make no sense at all and just completely discount those. [IMG]/img/vbsmilies/smilies/smile.gif[/IMG]
Currently it takes a whole lot of faith for me because my gains in cycling are very slow and hard compared to others. It takes me many months of consistent L4 training just to see the smallest of fitness gains. It has nothing to do with the solid advice that Dave and RDO have given to me. It has more to do with my genetics and that I simply will not progress at the rate like Sillyoldtwit did on the its killing me thread.
I probably could gain at a slightly better rate if I stopped training at the gym, but that is not my ultimate goal. If I were desiring to be a competitive cyclist I would without a doubt drop lifting because I have a better understanding of what it takes to get real results in the gym and what you have to do in the gym with progressive lifting or if you did it the right way you will not hit L3 or higher for a sustained period because of DOMS. None of what I do at the gym transfers to the bike except lugging my weight up a hill. So it is only the negative that transfers to the bike.
Stay focused on the goal with specific training is my advice