Based on my watches, 140mm is the perfect size for a 17 cm/6.75 in wrist, for watches with a lug-to-lug between 45-49 mm. 130mm is usable but can feel a little tight. For a lug-to-lug of 52mm, 140mm starts to feel a little too loose.
I love this strap. I originally bought it hoping it would work for my Tag Heuer chronograph but the color just didn't look right to me. With a quick swap to a 20mm quick release pin I think it matches the color of one of the dials on my new Timex Waterbury perfectly.