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  #16  
Old September 5th, 2017, 09:07
denverd1 denverd1 is offline
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Re: A probably-stupid tire question

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Originally Posted by rockclimber View Post
bad plan.

even in an open dif, the spider gears will fail rather quickly.
not a plan, its a response to a question. Would it get OP off the trail? yes it would.
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  #17  
Old September 5th, 2017, 09:26
RCP Phx RCP Phx is offline
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Re: A probably-stupid tire question

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Originally Posted by rockclimber View Post
even in an open dif, the spider gears will fail rather quickly.
Simply not true! When a open diff spins the wheels they are turning the spiders much much faster than it would with a unequal size tire in full contact with the road. Do you realize how many vehicles I see everyday with mis-matched tires!
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  #18  
Old September 5th, 2017, 09:32
VAhasnoWAVES VAhasnoWAVES is offline
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Re: A probably-stupid tire question

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Originally Posted by RCP Phx View Post
Simply not true! When a open diff spins the wheels they are turning the spiders much much faster than it would with a unequal size tire in full contact with the road. Do you realize how many vehicles I see everyday with mis-matched tires!
"simply not true!"

when the ring gear turns an open diff and both shafts are loaded equally... the spiders do not spin. they only spin in situations of uneven load, such as negotiating a turn. mismatched tires would like being in a constant turn. the spiders run on thrust washers, not bearings. they would fail.

Last edited by VAhasnoWAVES; September 5th, 2017 at 09:37.
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  #19  
Old September 5th, 2017, 09:34
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Nimrod Nimrod is offline
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Re: A probably-stupid tire question

Can't we all just get along?

Seriously though, thanks to all who responded. I've got all the info I need.
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  #20  
Old September 5th, 2017, 10:43
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rockclimber rockclimber is offline
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Re: A probably-stupid tire question

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Originally Posted by denverd1 View Post
not a plan, its a response to a question. Would it get OP off the trail? yes it would.
true. it would get you a few miles. I would certainly inspect the spiders and replace the thrust washers when I got it back.


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Originally Posted by RCP Phx View Post
Simply not true! When a open diff spins the wheels they are turning the spiders much much faster than it would with a unequal size tire in full contact with the road. Do you realize how many vehicles I see everyday with mis-matched tires!
how many vehicles do you see with tires with a 2-3" difference in diameter?

I can assure you it is absolutely true. the spiders will fail and they will fail quickly. I wouldn't drive more that 10 miles that way.
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  #21  
Old September 5th, 2017, 11:18
denverd1 denverd1 is offline
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Re: A probably-stupid tire question

LOL

Nimrod, glad you got it figured out. Otherwise, we'd be here all week debating spider gear explosion factors and the finer points of diff lubrication. yall need to go drive around in your rigs for a while
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  #22  
Old September 5th, 2017, 13:00
RCP Phx RCP Phx is offline
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Re: A probably-stupid tire question

But it's a very realistic scenario! One of the guy's in our club seems to have 2 tire failures on the same outing and hardly ever gets to use a same size tire coming out. To the OP's question, I'm not saying "race" home, but the difference between a 33" and a 35" tire in axle speed is only 43rpm@60mph, not accounting for any planetary action from the side/spider gears! "Been there/done that" many times in my 50yrs of driving with multiple vehicles and 0 issues!
Don't forget the other useful tool, air down on the big tire and air up on the small one!

Last edited by RCP Phx; September 5th, 2017 at 13:08.
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  #23  
Old September 9th, 2017, 10:01
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jeeptec jeeptec is offline
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A probably-stupid tire question

There was a recall back in the early 90's 4x4 Cherokee's were being built and sold with the mini spare. Guess what it burned up a few diffs and transfer cases. We had to put the correct size tire and wheel in back and inspect and repair as necessary.


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  #24  
Old September 9th, 2017, 10:48
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techno1154 techno1154 is offline
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Re: A probably-stupid tire question

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Originally Posted by jeeptec View Post
There was a recall back in the early 90's 4x4 Cherokee's were being built and sold with the mini spare. Guess what it burned up a few diffs and transfer cases. We had to put the correct size tire and wheel in back and inspect and repair as necessary.


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I always enjoy a lively discussion. Tire size, tire difference, differentials ability to spontaneously combust,.... http://www.naxja.org/forum/showthrea...ght=spare+tire

http://www.naxja.org/forum/showthread.php?t=19588

My 1994 and 1996 XJ's both came from the factory with mini also known as donut spear tires. Also, I have driven Grand Cherokees with mini spear tire.

What was the first Grand Cherokee was sold to the public?

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  #25  
Old September 9th, 2017, 10:50
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jeeptec jeeptec is offline
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A probably-stupid tire question

93 was the first model year but were sold in 92 as 93's


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  #26  
Old September 9th, 2017, 13:58
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iwannadie iwannadie is offline
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Re: A probably-stupid tire question

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Originally Posted by MDXJ View Post
I pulled a vacuum on my 35 and made it square.The back seat still works.
I would love to see the look on peoples faces when you pull out a square spare tire.
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