Funny, I'm 5'1.75 with a 29.6 inseam. Pretty close and certainly not leggy. I was nervous when I built a new bike and my fitter urged me to go to the standard crank length. I had only ridden my tiny wsd with 165 cranks. I can actually spin much faster now. I think it has more to do with my position on the bike and lighter wheels. I was pushed really far back on my old bike and forced to use my hamstrings more. My custom bike allows me to use my quads more which can fire much quicker. My understanding is that it's more about femural length in relation to your overall height. I trusted my fitter and I'm happy is all I know now. s