Smaller wrist here! Approx. 6.25" around. First of all, a year ago I thought a 40mm Sub was a bit too big, and now I think it looks great on me. So perceptions about what's too big can change. Now a couple tips: make sure the lugs don't extend out past your wrist, and try to go for watches with thinner cases. I can pull off a 42mm watch with a thin case much better than a 40mm with a thick case. Surprisingly, I can even pull off a Breitling GT, which is 44.something mm... the reason is that the lugs don't extend very far from the case. Yet the 39mm or 40mm Audemars Royal Oaks are too big for me, because the lugs extend so far. So keep in mind the lugs and how far they extend from the case. And if possible, go to an AD and try on the genuines for size before buying a rep!