I'm not sure what the shoe conversion is, but you can look it up online. Size 11 US is the size that could go either way. I have a size 11 US and I have a normal width board. My overhang is negligible at +15/-12. Some people prefer wide boards, and you can always look into a midwide board. Unless you're rocking +13 US I would say you'll be fine with regular board or midwide if you want a little more space to play with angles and centering.