Originally Posted by
ketsana
Thanks to you, I checked out the Fuji track classic at fosters and I like that it weighed 21lb flat. Not bad for 480$.
One other option is an argon 18 electron for $800. I would need a rear dia compe clamp on brake and levers though.
Finally there is the langster at 800$ as well but I would have to wait for a 2015 and don't like the sloping tt.
I'll be blunt, if your knees hurt the culprit is pretty much guaranteed not to be the weight of the frame. (especially when you're nit picking over the weight equivalent to a bottle of water) Get something that fits and adjust the gearing until it's comfortable and your knees will be fine.
(My Fuji Track Comp was 17.8Lbs stock, incidentally)