I used to wear size 38 Sidis and suffered immensely. My normal size is 36 and even going up 2 sizes didn't really help. I do not have wide feet, but I have a bunion on my left foot, which is also bigger than my right. It's not a huge bunion, but, it affects me. My LBS suggested I switch to Shimano shoes, which have a wide toe box, and 2 pairs of size 37, both road and mountain shoes are great.