I wear a size 10 1/2 shoe. Couple of years ago, I bought a pair of size 45 Genius shoes. They fit a bit snug and my big toe gets to hurting after about 40 miles. Probikekit currently has a good deal on the Carbon Wire Vernice model. They don't offer a 45 1/2 so I am wondering if a 46 might fit the bill or perhaps be too big. A search of Sidi sizing on the net is all over the map so I can't tell for sure. Anybody have any thoughts?