I have the Trek 7000. The 7100 you gain front suspension--really does a 66 year old woman need that? You also go from 21 speed to 24 speed. Again is that needed? I don't see the need for a higher high nor a lower low--everything needed is covered with the 21 speeds (and more--she want use all 21 speeds). Save a couple hundred and get the 7000. I put a Brooks saddle on mine and Niterider lights.