The bike's not heavier; you are. Well, not literally, but if you're seated, the bike is supporting your weight. When you stand, you're supporting your own weight.
yes that's what I thought....I try to alternate both but I do feel more comfortable seated in low gear spinning all the way up.
Love Never Fails 2012Giant Revel 1 -MTB 2013Giant Defy 5 - RB(Commute/Easy Rides) "Trooper" 2012Diamondback Response XE MTB (my son's) 13' FUJI SUPREME 1.3C (Selle Italia Diva/Easton EC70 SL) "My Girl"