So, my mom is an avid cyclist and has been bugging me about doing centuries with her for years now. She wants to buy me a super speedy road bike, but if I were to upgrade from my early 80's Bianchi I would like something versatile that I could tour with, but is also light enough to lug my 125lb ass up hills quickly for a century with my 90lb mamma. I am about 5'1 and would love a frame that comfortably fits a small woman. I'm clueless so any suggestions about light touring frames would be greatly appreciated. Thanks!