Originally Posted by
Snuts
My morning chuckle, thank-you.
Play with this it will give you expected circumference of given sizes.
Bicycle gear inch calculator
2.125 = 28.74"
Hope this helps,
-Snuts-
I like how that gives it in inches. When I set my bike computer I just use my method for finding diameter then multiply by pi for circumference. I tried measuring rollout and it was really difficult to get it any more accurate.
Happy to make you chuckle.