My mother wants to get a bike and she asked me to find one that's very comfortable for her. The main requirements are:
1. price less than $600
2. very comfortable (she's overweight at around 5'3 and 165bs maybe)
3. not too heavy so that she can handle it by herself
4. not too slow so that we can do some recreational rides together (I have a Cannondale Quick)
Any suggestions on what kind of bikes I should be looking for? Very much appreciated.