Here's a temporary upgrade, in the form of Mavic R-Sys fancy-pants lightweight wheelset with carbon spokes.  
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The front wheel weighs 589 g...  
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...while the rear one tips the scales at 814 grams.  
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Continental Supersonic ultra-light inner tyres for minimum rotational mass, at only 50 g each!  
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And finally, to maximize the weight saving - a set of KCNC quick-release skewers, weighing only 45 g for the pair.  
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In total, this wheelset shaved exactly 450 grams off of the bike, as compared to Ultegra setup, totaling at 6800 grams - which happens to be on the bring of the UCI 6.8 kg weight limit :-).  
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Strangely, I like the contrast of the silver rims against the matte black frameset.  
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A photo with my lightest bike so far, while I could - as I had afterwards sold the Mavic R-Sys wheelset together with my ex Scott CR1.  
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