Originally Posted by
tjspiel
Does it matter that much for most people's commute times? Probably not but it might matter a lot in how the bike feels. A lighter bike is also more convenient if you ever need to lift or carry it for any reason.
I've been taking a new shortcut to work recently where I have to shoulder my bike (yay for cx cable routing!) and hoof it up an embankment, and I can REALLY tell the difference of whether I've chucked a couple extra pounds of food items into my kittier (like today about +4-5lb for two jars of pickles and two cans of soup). The difference for shouldering is way more significant than, say the difference for climbing.