b.b. is the hardest climb I've ever done, I did it in 39x25 because that's all I have. On the "wall" I was basically tacking going trackstand to trackstand, till some drunkard gave me a push. Thank-you drunkard. Mt. Wash is 5 miles longer than b.b., with similar grades and more wind. MtW will dictate cadence to you. Take leetle short gears.