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  #1  
Old 02-25-2014, 03:32 PM
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Experience 275/55/20 flat tire

Hi, i want to share my experience with a flat tire that happened to me this weekend.
I have the nitto TG 275/55/20 and had a flat tire (back passenger tire), nothing unsual, i changed it and placed the spare tire 265/60/18 (not sure, but the normal spare tire the 4x4 overland brings.)
At first it seems nothing changed...everything was ok, i was at a highway and finished to my destination about 25km.
But when i went back home i felt that the transmision computer was confused and not knowing when to shift gears and making a clank when shifting. Most of it when going slowly in traffic maybe between 10-25 miles per hour. also it felt braked. maybe it was me that all my senses were very aware, but that is how it felt. It got to a point that i was even worried something wrong might just happen. Of course this confusing on the transmission must have been because of the difference in tire size.
But to finish i did get to my home (50miles) and fixed the 275/55/20 tire and placed it and everything went back to normal.

Now my question is, was this normal? Is driving the jeep with different tire sizes for that long (75 miles total) could damage something in it? i know that 3 tires are spinning slower than one tire, but i didnt imagine it can harm my vehicle. Can somebody confirm....

on another note i want to change and go up to 275/60/20...will this fit? i imagine that not in parking mode but at aeromode will it rub?

i await your comments,

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  #2  
Old 02-25-2014, 05:18 PM
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Re: Experience 275/55/20 flat tire

Your 275/55/20 has an outside diameter of about 31.9".

Your 265/60/18 has an outside diameter of about 30.5".

I would not recommend this much of a difference especially if you have 4WD vehicle. It can surely cause damage to the vehicles drivetrain.
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Old 02-26-2014, 10:50 AM
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Re: Experience 275/55/20 flat tire

It will not cause any damage, the front and rear differentials are designed to handle speed differences between the wheels, and also between the front and rear axles. They are not lockers or tight clutch style limited slips. These differences occur naturally as you are taking turns in normal driving. It does mean your differential thought you were taking a mild turn for 75 miles.... not ideal, but it should not have an adverse effect.
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Old 02-26-2014, 11:39 AM
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Re: Experience 275/55/20 flat tire

Does the overland have a 265/60/18 spare? The 'full size' spare in my limited is 245/65/18 although they share the same OD.
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Old 02-26-2014, 12:14 PM
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Re: Experience 275/55/20 flat tire

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Originally Posted by 2012 Summit View Post
Your 275/55/20 has an outside diameter of about 31.9".

Your 265/60/18 has an outside diameter of about 30.5".

I would not recommend this much of a difference especially if you have 4WD vehicle. It can surely cause damage to the vehicles drivetrain.
Ditto.

There might be a Limited Slip Locker in the Rear depending on Drive Train but that should not have engaged.

I still think it put undue stress on the system.

Another thing it could really mess up is ABS. Your ABS might have been pulsing one wheel or another the whole time to try and "Fix" the wheel that it thought was "slipping" (turning more than the others while driving straight).

Shutting off traction control might have helped and who knows what that system was thinking is wrong.
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Old 02-26-2014, 12:49 PM
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Re: Experience 275/55/20 flat tire

I just had a similar incident. Wife hit a pothole and blew out the right, rear tire. I have 20" SRT reps on and the spare was factory 17". The tire diameters were only 1/4" different, but she had 100miles to drive home. I elected to err on the side of caution and used my AAA membership to have the truck shipped home on a flatbed. I read somewhere that more than a 1/8" diameter difference is not recommended, which is pretty small.
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Old 02-26-2014, 01:02 PM
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Re: Experience 275/55/20 flat tire

Quote:
Originally Posted by webspoke View Post
It will not cause any damage, the front and rear differentials are designed to handle speed differences between the wheels, and also between the front and rear axles. They are not lockers or tight clutch style limited slips. These differences occur naturally as you are taking turns in normal driving. It does mean your differential thought you were taking a mild turn for 75 miles.... not ideal, but it should not have an adverse effect.
I respectfully have to disagree. Overtime, damage to the drivetrain will likely occur.

Different size tires from side to side can cause problems. The shorter tire will have to rotate faster than the taller tire. This causes the differential to spider gears to spin and can cause undue wear. The larger the difference, the greater the problem. With limited slip differentials the problem will be far worse.
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Old 02-26-2014, 01:16 PM
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Re: Experience 275/55/20 flat tire

Article from Tire Rack that supports using caution when mixing tire sizes on 4wd and AWD vehicles:

http://www.tirerack.com/tires/tirete....jsp?techid=18
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Old 02-26-2014, 03:23 PM
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Re: Experience 275/55/20 flat tire

from what i read here and what i felt....it does make the system act abnormal, and i imagine that it is a matter of time before something happens.
What i imagine could help is putting the car maybe in sport so it has a 80-20 force in transmission and also turn of slip differential.
In my case i ran a total of around 60-70 miles like this. Nothing bad happened, but i definitely had a strange sensation that something was not working properly. So it is better to avoid then to regret.
thanks for your comments,....
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Old 02-26-2014, 03:47 PM
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The Jeep site lists a full-size spare as being available with certain packages. So what's the standard spare tire size/diameter? I would think then that it's smaller. I know OP has a full-size spare, but is also running taller than OEM tires, so it creates a similar condition. So my thought is that it can't be terrible as long as you don't ride on it too long.
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Old 02-26-2014, 04:18 PM
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Re: Experience 275/55/20 flat tire

Quote:
Originally Posted by Steiner84 View Post
The Jeep site lists a full-size spare as being available with certain packages. So what's the standard spare tire size/diameter? I would think then that it's smaller. I know OP has a full-size spare, but is also running taller than OEM tires, so it creates a similar condition. So my thought is that it can't be terrible as long as you don't ride on it too long.
Outside tire diameter is the same...
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Old 02-26-2014, 04:30 PM
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Quote:
Originally Posted by 2012 Summit View Post

Outside tire diameter is the same...
So how is a full-size spare different than a compact spare if it has 30.5" OD?
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