im tryimg to decide on a sprocket size to go with. im thinking 37 might be the one. im about 190lbs and would like to be able to get up any hills i may come across at 50-55mph. my usual trip to work is mostly 30-40 thru town but there is a strip of 2 miles thats 55 with 2 long hills. most people drive 60-65 thru there and i would like to keep up the pace. what sizes have others went with and how do they work for you?