For me lifting weights above the waist has helped my cycling. Most likely reducing general fatigue and core strengthening. When I cycle I don't lift weights because of fatigue and time constraints. Leg weights negatively affect my training so I don't do them.

My routine is a 30 minute circuit workout followed by a 3 mile run or 30-40 miles of cycling. I believe the circuit workout is best for me so I don't bulk up, get faster muscles, and improve cardio system.