Climb to Safety wrote an answer about La Sportiva Solution Climbing Shoe - Discontinued Rubber on April 13, 2010
40.5 is not too far off for a good fit man. I have a size 12 street shoes foot and wear a 42/42.5 in La Sportiva (Solutions and Miuras are my experience). I found the size 42.5 Solutions to be about the same size and feel as my old US size 12 Five Ten Dragons. Definitely do not size up to 43 or 44 as was previously suggested. Enjoy these man... the only thing that sucks about them is the durability of the closure system : ( The good thing is that the shoes work even without it... those things just suction on : ) Sweet!