Mine is 195 mm around left wrist. Check my older posts for pics of my 38mm sport. It fits perfectly, second last hole on M/L part of sports strap. Not too tight either. Could force to 3rd last hole if I wanted it tighter. I feel like the strap is ever so slightly stretching over time (2 weeks), but this is not a bad thing at all.
One photo -
https://forums.macrumors.com/attachment.php?attachmentid=544752&d=1429880338