To update this... I ended up putting a new chain on the bike for my mom (the purple bike) & gave it a new cassette, then my sis & I brought the bike down to her yesterday. The hardest part of the whole thing was getting her bike and mine onto the train that goes to my parents house...the stairs to board are steep!

My mom was a little skeptical about riding a bike, she hadn't ridden one in decades, but she loved it. She was grinning ear to ear and got really good at shifting properly to get up hills. We rode a couple of miles with her and when we got back my dad said 'I want to try it!' He was racing around like a kid. After lunch, my mom said: "are we going to go ride our bikes again?" so she and I went out and visited some neighbors. She rode a little over 5 miles on her first day!

I love bikes.

Anne