Guess we all have our own way of measuring tires. Me, I do what is supposed to be done and measure the tire when installed and with the weight of the vehicle on the ground and then from the ground up to the shoulder where the sidewall makes a 90° to become the tread. This is the proper way to get an accurate measurement so that you can calibrate your tires. Having said that, I have yet to run a 35" tire that has come close to measuring 35" brand new. If you're measuring your tires mounted, at full inflation and off the ground and from the highest point of the center of the tread to the same on the opposite side, yeah, I suppose you could get close to that but, I guarantee you that your speedometer would be off.
Yes that is how I measured them. on the vehicle parked on cement. My speedo is 100% on set with my procal and verified by two separate Garmins and a phone app.
First off, you do realize that the 70 in the 285/70R17 = 70% of the tread width to make up the height of your sidewall, right? In other words, it'll be shorter than a 75 and by quite a bit being that you need to add that to both sides of the tire. Second, have you ever taken the time to measure an advertised 32" tire? Do you really think they measure 32"? Don't get me wrong, you can do what you want with your Jeep and it won't be any sweat off my back. You just expressed concerned about your wife and her ability to get into your Jeep and I was just trying to help by putting things into perspective as so you don't make a mistake. You can take what I have to say or leave it :yup: