Using more words doesn't make you right...just makes you more wrong.
You can lead a horse to water...but, in this case...its just a stupid horse.
Bottom radius of my 39s = 19"
Effective diameter = 38"
Circumference = 38x3.14 (Ď€) = 119.32"
For 37s I'll estimate, since I don't have them anymore...
Yeah - you’re wrong anyway. Top half of the tire is irrelevant when measuring tire size.
I have open diffs.
https://www.jkowners.com/threads/37s-with-35-spare.278057/
It’s extremely common that they lift them. As in I e never seen a Jeep dealer that didn’t. Huge money maker. They make mall crawlers day and night and charge a kings random.
I’m saying all that matters is the measurement from the ground to the axle shaft center. Which is why your Speedo is measured that way when you get new tires.
That’s not true at all. What matters is the measurement from the ground to center of the axle shaft. Which is why you don’t measure the entire tire when resetting the speedo - you measure the ground to axle shaft center. I don’t care about the diff (I have open diffs)…tricking the speed sensors...