Using a heavy bike for training

I know a lot of guys tend to like carbon forks, aluminium or carbon frame and some decent lightweight wheels, etc. All in all you go very fast with a moderate effort (in my estimation obviously). The thing is I've been riding the kona now for a few weeks, its quite heavy but I love it. What I find very odd though is that I can hill climb and actually enjoy it, where as on my old Marin Sausilito it was a very light bike but hills were a nightmare.. perhaps partly due to the way the gears were set up..
So here is my thought of the day. Is it of more value to train on a heavy bike and save the lighter ones for races and such? Or do you all prefer the comfort a lighter bike can sometimes provide? Like quick gettaways at the lights.
So here is my thought of the day. Is it of more value to train on a heavy bike and save the lighter ones for races and such? Or do you all prefer the comfort a lighter bike can sometimes provide? Like quick gettaways at the lights.

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Hope tis makes sense :?
Winter = 531c 1983 Raleigh with 8-spd Shimano 600 throughout
Spring/Autumn = 631 Raleigh with 9-spd Ultegra throughout
Summer = Titanium with 10spd Dura-Ace
I notice the difference between all of these bikes and love their individual quirks.
What do I ride? Now that's an Enigma!
As said above, it didn't necessarily seem to make a lot of difference once I went to the Bianchi, at ~20lbs. This winter I was using a single-speed Spesh which although similar in weight to the Bianchi, meant riding in a different way, which made it harder.
By swapping around, all this has led to a better appreciation and enjoyment of the different feel of each bike, and more fun generally.
In terms of the theory, if you expend X amount of energy on a heavy bike you will achieve a fitness level of Y and accomplish an achievment of 'Z'..
All other things being equal, if you then expend that X amount of energy on a lighter bike, at the same fitness level, you will accomplish Z a lot quicker and/or easier, or achive 'Z+'.
You can do the same thing by hauling a belly around with you (like me) and then getting rid of it (I am getting there...), or strapping a full camelbak on every trip over the winter and then leaving it off in the spring.
It works: I know someone who does.
Singlespeeds in town rule.
Personally I feel like I've developed more core body strength and leg strength that with the lighter bike. As Unclemalc says its a different feel with different bikes obviously.
I only notice the difference for about the first half hour of the ride - after that - I cant tell.
I dont think theres any real benefit, apart from heavier usually = cheaper ?
Tell that to the pros who ride the same frame all year round. :roll:
They change their wheels but that's more for strength of the wheels than anything else