I know I've posted a lot the last few days but I've only been commuting for a week now by bike. I am a college student so I had to dig my old mountain bike out of my gorage because I can't afford a road or a hybrid right now. My bike is a roadmaster granite peak 26" woman's. I'm not sure how much it weighs exactly but it's quite heavy. I live in a very hilly area and struggle to her up hill in this bike. However other bikers fly by me every time. I feel a little embarrassed (lol) is it my bike keeping me from going fast up hill or just my rider skill? Dose anyone else commute on a mountain bike mostly on roads?