The free online service Trailforks is great. Maps are color coded for difficulty. Clicking on a trail opens a the trail profile window so you can check the trail grades at any location. With a heavy Rad bike knowing the grades ahead of time is key. If you enjoy the service donate some $$ or join the pay service its cheep like $1.25 a month. Its nation wide but free service only covers the 40 miles of so near you.