How much is down to the bike?

same here 6'1'' 150Ibs climbing hills is easy but I have to eat even on a 30 mile run metabolism like a runaway train
i think that genetics are a major factor in all this

They do, but your not trying hard enough!I am 5'11 75kg but if I cane the lager, and eat really badly I can put weight on no problem. I am like a racing snake:)