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but halfway through a climb i certainly would ! i think i would discount any frame over 2 kg.
You won't even feel the difference when climbing a mountain when using a 8,5 kilo steel bike in stead of a 7 kilo one. I swapped my 7 kg Cannondale CAAD10 for a steel Colnago Master Extra Light (using the same parts as on the Cannondale) and uphill that didn't make a difference. And I used it for a 175 km Dolomites ride with passes over 2600 m... It's just in our heads. ;-)
When buying a steel frame you don't care about the weight...
But I think these weigh about 1600-1700 g (frame only).