I wear US 11 in Nikes (not that i enjoy buying them--they fit my feet best for hoops). Tried on Sidis two weeks ago and needed a 46 in length. Usually in Specialized shoes I wear 45. Do you have a wide or bulky foot? In the Sidis 45.5 was a little too short but width in both 45.5 and 46 was fine. Still i think the length runs a bit short for sizes 11+ it seems.rdbike said:I wear a US size 11 and ordered Genius 4's, size 46's and sent them back (to tight). 47's seem to work well....am I crazy or do these shoes seem to fit better a full size bigger?