For me personally? I honestly don't know, and this is why I'm such a hypocrite as I love bragging about my 1375g aluminum clincher wheelset I built. I THINK I can feel the weight difference when I'm loaded up for a climbing century with my extra clothing layers, 2 full 28oz bottles in the cages plus a small one in my back pocket, and plenty of food; but even that can be placebo.

I definitely notice the 30 lb I've gained over the past year due to dramatically reduced riding