In general, crank length should be matched to your leg length and type of riding. Short legs or spin alot? 165 might work. Single speed MTB or longer legs? 175 or 180. Fixed gear or avg. height? 170 should do.

No of this making sense? Of course not. Throw them on and see if they work. I'm 6'0" and run 175 on my SS MTBs and 170 on my fixed. Take it for what it's worth.