A true 35inch tire
05-05-2011, 10:10 PM
#4
JK Super Freak
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as far as i understand it is if you measure that tire off the vehicle it will be full size. any tire will lose a little when mounted. the difference between say a mtr and a bfg is the bfg is smaller than 35 off vehicle as well
05-06-2011, 02:15 AM
#7
JK Jedi Master
Where do you measure size? I can think of several ways:
1. From the ground to the shoulder where the tire shape makes a sharp turn into the tread. This is the correct place to measure for your Jeep's speedometer calibration--at least it works for a Hypertech. It will be about 1-2" smaller than "true".
2. From the ground to the very top of the tire (place a level ruler to the crown of the tread). Other than seeming a logical way to measure a tire size, I don't know why anyone would want to do this.
3. From the crown at the front of the tire to the crown at the back of the tire. This is a great way to get the largest number so you can say your have a "true" whatever size tire.
4. From the shoulder at the front of the tire to the shoulder at the back of the tire. Again, I have no idea why anyone would measure it this way, except that perhaps it seemed logical to him.
5. Measure the circumference of the tire (while mounted and under load) and divide by pi. This will probably give you the most "accurate" size, but who really goes to this trouble?
Bottom line asking about tire size is like asking about what gas mileage people are getting: Most folks who answer have a variety of methodologies that affect the results, making honest attempts to answer suspect.
1. From the ground to the shoulder where the tire shape makes a sharp turn into the tread. This is the correct place to measure for your Jeep's speedometer calibration--at least it works for a Hypertech. It will be about 1-2" smaller than "true".
2. From the ground to the very top of the tire (place a level ruler to the crown of the tread). Other than seeming a logical way to measure a tire size, I don't know why anyone would want to do this.
3. From the crown at the front of the tire to the crown at the back of the tire. This is a great way to get the largest number so you can say your have a "true" whatever size tire.
4. From the shoulder at the front of the tire to the shoulder at the back of the tire. Again, I have no idea why anyone would measure it this way, except that perhaps it seemed logical to him.
5. Measure the circumference of the tire (while mounted and under load) and divide by pi. This will probably give you the most "accurate" size, but who really goes to this trouble?
Bottom line asking about tire size is like asking about what gas mileage people are getting: Most folks who answer have a variety of methodologies that affect the results, making honest attempts to answer suspect.
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05-06-2011, 02:17 AM
#8
JK Jedi Master
Setting aside for the moment my comment immediately above, I will say that when I had a Rubi with stock MTRs parked next to my Jeep with DC FC II 33" tires, the Rubi tires were slightly, but obviously, taller. This is really the only way to compare tire sizes unless you specify how you want tires measured.
05-06-2011, 05:56 AM
#10
JK-Forum Founder
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in order to get a "true" 35" tire shoulder to shoulder at street pressure, you'd have to get a 37" tire. rather than being so focused on "true", you should just concern yourself with what is writen on the sizewall as everything you'll do to your jeep will be based on it and NOT what is "true".