I run 165's because I have a limited range of motion in one knee. It was a godsend for that purpose.
IF you have no trouble spinning 175's, stick with them.
IF you have other crank lengths that you can experiment with, I suggest you do so for your own gratification. Give them a couple days and make sure to dial in the seat height.
My length/cadence results were- I'm 5-11. (Used to be almost 6'1", but short legged)
175-60
170-80
165-85
160-80>82 and really felt too short.
BTW- Any "loss of leverage" can be compensated for by a slightly lower gear and faster cadence. You will likely end up producing "more power" with the "correct" length.
Last edited by Bill Kapaun; 06-30-15 at 12:50 PM.