^ what this guy said! Damn that was good info man (as a fellow cyclist!) Power meter is the key here which i have started using as of lately! these things work and will help you gauge the amount of power you should be putting out!
late into the game here, but cycling in general is a very tough workout when using the right gearing and going up harder climbs (+8 % grades) - could explain the power he's putting out in the gym. i've been cycling for several years now and my legs are bigger than even when i used to play...