I was comparing with skewers (used new ones that came with SLRs), same cassette and with the same tire on a scale good to +/- 2 grams. My stock wheels are heavy. total weight loss was due to replacing the Axis Classic wheels from my 2014 Specialized Secteur Sport. I do not have the weights in front of me but they did total to 1.6 lbs when combined for both wheels.

Replacing wheels was a piece of cake. The SLR come with a spacer in case you have an 8, 9 or 10 sp cassette (like I did). Put it on the hub before you put the cassette on the new wheels.

I had started a thread where I got good advice on swapping wheels:

http://www.bikeforums.net/road-cycli...eels-help.html

everythign I needed to know about swapping came from this thread

I also put the old tires back on the stock wheels and in all it went extremely quickly. Just make sure you tune your rear derailler and check your brakes before your first ride after installing the new wheels.