Originally Posted by
Jrasero
I am 5'5" and used to use 170mm cranks but switched to 165mm. Not sure about opening up the hips, but it does allow me to run less seat post and has less toe tap
Allows you to run less seat post? You mean you lowered saddle?
Actually if you go to shorter cranks then the saddle height should go up when measured to the BB. But if you measure from the top or center of the pedal when furthest away from the saddle, then that distance should pretty much stay the same regardless of what length crank you put on the bike.