For those of you familiar with cycling in Boston and NYC, how hilly is Boston, MA compared to NYC, NY? I'm only familiar with NYC since I live here but will be visiting Boston in a month. I'm riding my single speed (otherwise I wouldn't be asking if I had gears).

I ride 70GI in NYC and can easily climb the bridges, Harlem hill, etc on that ratio. I know the city is considered to be flat but how does it compare to Boston?