My thighs are only about 52 cm/20.5", and my calves are 39 cm/15.4". But there's not much fat down there on my body. I'm currently 179 cm/5'10.5" and 66 kg/145 lbs. My bone structure is very thin, though, especially in my upper body. My wrists are only about 15 cm/6" around, and my ankles are 21 cm/8".