http://main.acsevents.org/site/TR/Co...al&fr_id=41596

This page shows the elevation changes along the route. Central MA is certainly hilly...the route you'll be doing is probably not quite as hilly as it gets a little further west (Worcester, Fitchburg etc.) but not flat by any stretch. Does your bike have a triple? That is helpful on the short steep hills you'll be dealing with. The nice thing about hills is that you get a little break on the way down.