I have hit the gym since High School Football, and will be 64 this spring. I have slacked off on the legs since I ride about 200+ miles a week when weather allows, and hit the trainer when it does not. I still do one set of 50 squats with body weight + 50 lbs on off days, and leg curls, 3 days a week. That, along with calf and reverse calf raise, combined with the Road Bike, suit my needs.

You are very likely younger than I, and can hit it a lot harder. Figure out which one is your primary passion. Excessive gym time will hurt your cycling, and excessive cycling will hurt your gym time. If cycling is your passion, adding 20-30 lbs will slow you down on hills. My primary passion is on the road bike, but still hit it hard in the gym. I am 5' 11", 155-160 lbs, and right at 9% BF.