Istill recommend the small bands though, those will definitely fit you because I remember wearing them on the 3rd/4th hole on my old S3. Final advice: go for a 40/41mm watch and use the smaller bands, those will definitely fit. Btw, the 40mm watches are smaller than they look imo. Technologyman45 • 1 yr. ago. whatsize band do I need for series 3 small what size band do I get for my series three apple watch. 1 year ago 806 1. How can I find what size band I need for my I watch? I want to change it. i want to get a new band for my watch but I don’t know the size to order. 3 years ago 180 1. Ifyou have a 7 inch wrist, you should go with a 36mm-42mm diameter watch. It would fit your wrist best. But, if your wrist circumference is more than 7.5 inches, then a 40mm or more timepiece would be perfect. Similar to fashions, watch size trends come and go. During World War II, small wristwatches were popular among the soldiers. Menwatches size 40 to 42 mm Showing 1–60 of 63 results Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Mywrist is 165-170mm. I have an apple watch 7 45mm. If I want a leather band, I guess I need to take the 45mm, but I am in between the two sizes and I dont know which to take. S/M is for 140-180mm wrists M/L is for 165-205mm wrists Which one should I take for my ~165-170mm wrist? 170175 is definitely medium not small. Go with the 45mm unless you want a small watch. I think with your wrist size you could go either way. My wrist is a little bigger and I actually prefer the 41mm because it’s smaller and does not get in the way or bang on everything I walk by. Considering I have a 162mm wrist, have always worn the 42/44 sPBx.