Often my schedule works out such that I go to the gym in the morning and ride later that afternoon or evening. On those days I can tell my rides feel more labored with tired legs. I'm not doing intervals yet, other than longer climbing efforts at Z3-4, but climbing is not easy after the gym. Obviously when I start doing structured intervals at Z4 and above it won't be on gym days but I still need to ride those other days. It is difficult for me to schedule days solely for the gym and weather plays into that too. For those that do both the gym and ride how do you work it out?
I'm still in base/build so being tired on rides isn't such a big deal. I'm thinking down the road when the intensity increases how it will all fit together.