Wider Wheels = Worse Handling?

[MarineHawk]

Actually it is interesting. If you would have read his post: he has 35s, Under load they actually measure 34”, but he had to enter 32.75” to get the Speedo right. Dude, does that make sense?

"The only problem I've had is that when you measure the top of the tire to the ground they are right at 34" high (supposed to be 35") and I bought a Rough Country programmer to re-program the tire size. I had to program 32.75 …"

I resized to 35s at the dealer, and I'm spot on. Rough Country makes crap. Maybe that's the difference.

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[danielspivey]

"The only problem I've had is that when you measure the top of the tire to the ground they are right at 34" high (supposed to be 35") and I bought a Rough Country programmer to re-program the tire size. I had to program 32.75 …"

I resized to 35s at the dealer, and I'm spot on. Rough Country makes crap. Maybe that's the difference.

Makes sense, my bet is the error is on rough country’s calculations...

 

[ShadowsPapa]

"The only problem I've had is that when you measure the top of the tire to the ground they are right at 34" high (supposed to be 35") and I bought a Rough Country programmer to re-program the tire size. I had to program 32.75 …"

I resized to 35s at the dealer, and I'm spot on. Rough Country makes crap. Maybe that's the difference.

What I find interesting is the number of people who don't understand the relationship between diameter, circumference, etc. and/or failed high school geometry classes.
You simply can NOT and should not ever go by the measurement of a tire on the vehicle.
People who install a tire and then say "well, the tire is 34.5" tall but they claim it's a 35" tire" are, well, I won't get into it. There's no use trying to explain it to 'em.
Tire height is NOT diameter - period. Anyone who installs a tire and then measures it is not very clever, to be blunt.
That isn't diameter. And worse, that measurement will be different on MY truck than it will be on your truck, or someone with a Sport vs. a Sport S with max tow vs. a loaded Rubicon and so on.
My tires mounted on any other JT will measure different installed height - and, they'll measure different today in Iowa than they will tomorrow in Dade County, Florida and different in Prudhoe Bay, Alaska at midnight. That's because it will change with tire air pressure (which also changes with air temp.)
DIAMETER will get you the circumference which will get you an idea of the tire rotations per mile which will get you a starting place for other calculations. Not tire height installed.

 

[danielspivey]

What I find interesting is the number of people who don't understand the relationship between diameter, circumference, etc. and/or failed high school geometry classes.
You simply can NOT and should not ever go by the measurement of a tire on the vehicle.
People who install a tire and then say "well, the tire is 34.5" tall but they claim it's a 35" tire" are, well, I won't get into it. There's no use trying to explain it to 'em.
Tire height is NOT diameter - period. Anyone who installs a tire and then measures it is not very clever, to be blunt.
That isn't diameter. And worse, that measurement will be different on MY truck than it will be on your truck, or someone with a Sport vs. a Sport S with max tow vs. a loaded Rubicon and so on.
My tires mounted on any other JT will measure different installed height - and, they'll measure different today in Iowa than they will tomorrow in Dade County, Florida and different in Prudhoe Bay, Alaska at midnight. That's because it will change with tire air pressure (which also changes with air temp.)
DIAMETER will get you the circumference which will get you an idea of the tire rotations per mile which will get you a starting place for other calculations. Not tire height installed.

So you got me thinking... it makes sense that the profile of a tire is flatter on the bottom when mounted and under load. But does that really change the circumference (length of the tread)? If not, then technically it shouldn’t change the distance that tire will travel, thus speedometer/speed right?

Secondly, a mounted tire will have a different radius from the center of the rim to the road, versus the center of the rim to the top of the tire... so this is where that loss of height comes from, the smooshed radius on the downside of the tire. It would be interesting to see tire manufactures list the radius of the downside of the tire under correct psi and dry load so you can get a clear idea of estimated height gain with a larger tire.

 

[5JeepsAz]

I asked a dumb question on another thread but here it is again for this rare collection of tire enthusiasts:

My old '64 Gladiator is geared low. I want to maximize speed to get from 60mph to 65mph.

Will bigger tires lower rpms sufficiently?

 

[Texops]

What I find interesting is the number of people who don't understand the relationship between diameter, circumference, etc. and/or failed high school geometry classes.
You simply can NOT and should not ever go by the measurement of a tire on the vehicle.
People who install a tire and then say "well, the tire is 34.5" tall but they claim it's a 35" tire" are, well, I won't get into it. There's no use trying to explain it to 'em.
Tire height is NOT diameter - period. Anyone who installs a tire and then measures it is not very clever, to be blunt.
That isn't diameter. And worse, that measurement will be different on MY truck than it will be on your truck, or someone with a Sport vs. a Sport S with max tow vs. a loaded Rubicon and so on.
My tires mounted on any other JT will measure different installed height - and, they'll measure different today in Iowa than they will tomorrow in Dade County, Florida and different in Prudhoe Bay, Alaska at midnight. That's because it will change with tire air pressure (which also changes with air temp.)
DIAMETER will get you the circumference which will get you an idea of the tire rotations per mile which will get you a starting place for other calculations. Not tire height installed.

Hey ShadowsPapa the JL mini programmer asks that you enter the tire hight mounted on the vehicle to program tire size. So yes it’s different on every tire set up

 

[MOS63B20]

I Have an automatic internal ability that I sense my speed within 3 MPH so if the speedo is off that you travel less miles Per odometer reading.. saves the mileage life on your Gladitor..

 

[danielspivey]

I Have an automatic internal ability that I sense my speed within 3 MPH so if the speedo is off that you travel less miles Per odometer reading.. saves the mileage life on your Gladitor..

Maybe saves mileage off the odometer, but not on the actual gladiator. In your case it probably equates to like 5% less, which is like 105k vs 100k miles Or 52.5k vs 50k miles. Don’t think this would be quantifiable in resale savings if that’s what your Implying.... Either way, larger tires is going to be added stress and more wear to the vehicle.

 

[MOS63B20]

Honestly it will not matter to me the miles or the wear-and-tear factor oh, it will not be a resale truck it we'll be inherited by my son.
Give this vehicle a little credit I'm sure bigger tire will not hurt this JT maybe the wheel bearings will be a little more worn ball joints possibly miles and time later. nothing lasts forever. enjoy your build..!

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