I'm too lazy to look up the link right now, but when 10 speed 105 came out there was a review comparing it with Dura-Ace.
The ENTIRE 105 group was almost 1 lb heavier than the ENTIRE Dura-Ace group. That's one expensive pound.
On your build, low end wheels are costing you some on weight, and depending on what they are...I've seen seatposts and stems that are boat anchors.
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Good night...and good luck