I need a replacement, 700 rear Wheel , hub , and cassette, for my Bianchi Volpe Cx. Currently using a 7 speed 12-28T cassette, but would like to upgrade if possible. Would like to keep existing bb, and front chainrings. I do not need anything high end, as this is going to be a winter/tow the kids around/go to the store bike, after I replace it this year. I keep breaking spokes on my old araya rims, and would like to know what wheels, hub and cassette are compatable, with my present 28-40-50 chainrings, or should I replace them too? I will be replacing the rear derailler as well. Thanks for your help!