Stock spare & 255/70/17s - Can you run different sized tires? - Jeep Commander Forums: Jeep Commander Forum
Wheels / Tires This section contains discussion about wheels and tires for your Jeep Commander.

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post #1 of 53 (permalink) Old 10-28-2008, 11:08 AM Thread Starter
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Stock spare & 255/70/17s - Can you run different sized tires?

I have a question that was breifly touched on in another thread but I believe this deserves it's own thread beause of its potential importance.

So many of us are running larger tires and do not have a spare that is the same size. If you were to run the stock spare with three 255/70/17s (since 255/70/17 will not fit in the spare location with tow package) - Are you pretty much gauranteed to rip up the transfer case or would the ESP/traction control put it in limp mode and save damage from happening?

I need a way to carry a spare that looks OK. I dont care for that swinging tiregate that a couple guys have - It looks too generic and too far away from the tailgate - Get Lost 4x4 should design a hitch mounted one that sits up closer to the tailgate that looks stock. That's something I would buy - Hint, Hint

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post #2 of 53 (permalink) Old 10-28-2008, 11:22 AM
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I am not an expert by any means but I would bet $ that you will damage your XK by using a spare that is a different size for any real distance. Looking forward to our experts opinion.



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post #3 of 53 (permalink) Old 10-30-2008, 11:31 AM Thread Starter
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...I can't believe nobody has an opinion on this?

Jon
3.7L 65th Anniversary Edition

K&N Aircharger
AVIC-D3 (hacked),Sirius,6 Disc Changer
Remote Start
Teraflex 2" Lift Kit
1.5" Spidertrax Spacers
265/70-17 Bridgestone Dueler AT Revo 2
Chrome Bull Bar, Jeep Sport Load Bars w/Kayak mounts, Rear Grab Handles
Hella FF200 Driving Lights w/foot switch
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post #4 of 53 (permalink) Old 10-30-2008, 11:44 AM
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If you drive more than 1" on mismatched tires your going to do damage. The NV245 is fully locked all the time so if you manage to even get it to move from the ESP working you will either tear up the differentials or you will kill the transfer case. If you are not running with a full size spare right now then you need to call for a tow if you get a flat tire. As for a solution to getting a spare somewhere on there, you can try something like this there are several manufacturers out there but this is just the first one I came across on google. http://www.sportsimportsltd.com/unhimosptica.html

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post #5 of 53 (permalink) Old 10-30-2008, 12:13 PM Thread Starter
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Quote:
Originally Posted by adamag25 View Post
If you drive more than 1" on mismatched tires your going to do damage. The NV245 is fully locked all the time so if you manage to even get it to move from the ESP working you will either tear up the differentials or you will kill the transfer case. If you are not running with a full size spare right now then you need to call for a tow if you get a flat tire. As for a solution to getting a spare somewhere on there, you can try something like this there are several manufacturers out there but this is just the first one I came across on google. http://www.sportsimportsltd.com/unhimosptica.html

That carrier is an option but you can't open your liftgate then.

I guess I dont really understand the difference of having a smaller tire on one wheel (more revolutions) and off roading and having one tire spinning (losing traction) and the others not spinning.

Jon
3.7L 65th Anniversary Edition

K&N Aircharger
AVIC-D3 (hacked),Sirius,6 Disc Changer
Remote Start
Teraflex 2" Lift Kit
1.5" Spidertrax Spacers
265/70-17 Bridgestone Dueler AT Revo 2
Chrome Bull Bar, Jeep Sport Load Bars w/Kayak mounts, Rear Grab Handles
Hella FF200 Driving Lights w/foot switch
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post #6 of 53 (permalink) Old 10-30-2008, 01:59 PM
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Driving with the original sized spare with 3 other oversized tires is obviously NOT a great idea, and not a long distance solution, but I dont think there would be major damage to the differentials, especially in 4H. You may have to shut the traction control off, due to different axle rotations, but nothing in the 4x4 system is 'locked up' thats the whole idea of the clutch packs in the axle difs and the trans case. Thats my thought at least, would like to hear from the techs/engineers on this.

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post #7 of 53 (permalink) Old 10-30-2008, 07:46 PM
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I'm with Bulldog9

I wouldn't do it at highway speeds of 70mph but to limp to a service station. In a turn one wheel travels faster than the other and it does not make the transfer case OR differentials explode

just my opinion though
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post #8 of 53 (permalink) Old 10-31-2008, 09:55 AM
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Quote:
Originally Posted by Higgins11 View Post
I'm with Bulldog9

I wouldn't do it at highway speeds of 70mph but to limp to a service station. In a turn one wheel travels faster than the other and it does not make the transfer case OR differentials explode

just my opinion though
x3,
I cannot see enouph difference in circumference to cause any harm.
I believe the transfer case would only interpit the slight driveshaft speed difference as cornering.
The driveshaft r.p.m. difference is the same with the mismatch, regardless of speed, so I wouldn't be concerned about operating speeds, beyond being consevative.
From a wear standpoint, the differential pinions would experience more potential than the transfer case as it uses planetary gears.
But, I'm talking thousands of miles with a mismatch, not the 50 or so miles before the correct tire is remounted.
If I was running the moderate oversize being discussed, I would have little concern if I used the original circumference as my spare.

I'm basing my opinion on:
1. Minimal difference relative to tire circumference.
2. The fact that the circunference difference must be divided by the axle ratio to determine the change in driveshaft R.P.M. front to rear.
3. The fact the transfer case is only locked in low range and would not be operating on hard ground in this mode.

My $.02, but I bet Jeep would agree.
.....Rob


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post #9 of 53 (permalink) Old 11-01-2008, 08:45 AM
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Quote:
Originally Posted by Bulldog9 View Post
Driving with the original sized spare with 3 other oversized tires is obviously NOT a great idea, and not a long distance solution, but I dont think there would be major damage to the differentials, especially in 4H. You may have to shut the traction control off, due to different axle rotations, but nothing in the 4x4 system is 'locked up' thats the whole idea of the clutch packs in the axle difs and the trans case. Thats my thought at least, would like to hear from the techs/engineers on this.

There are not clutch packs in the differentials on QT I and QT II. They have open differentials (spider gears)!




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post #10 of 53 (permalink) Old 11-01-2008, 08:52 AM
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All three of you are wrong and apperently know very little about the driveline on a Full Time Four Wheel Drive Vehicle. You never want to use a different size tire especially having a spare tire size of 245/65R17 and the other three tires being 255/70R17 (or whatever size tire that was mentioned earlier in the thread). The stock tires are 29.5 inches tall and a 255/70R17 is 31.1 inches tall, thats a huge difference. You should always have a full size spare with you.




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