ok, here's my deal. I train in a size 41 Sidi road shoe. Last year I got a pair of size 40 Sidis. they fit like a glove. i wear them on the track, at crits and TTs but they are a bit tight for road races or long training rides, but I love feeling snug in them, especially on the track. I'd like to try the 40.5s but don't want to unload a lot of cash. anyone have any old ones they want to part with on the cheap? i also have two pair of mtb shoes (great for winter training, cyclocross and of course mtbing) that are a bit big for me -- one is a Northwave size 40.5 and the others are Specialized size 41. The Specialized ones have about three rides on them; the Northwave ones are a bit more used, both have spots for toe spikes. Let me know what you've got. My Sidis are mens 41 - not sure if there really is a differnce between the mens and womens.