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Author Topic: I got another doozy of a question!  (Read 2879 times)

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Offline tb3

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I got another doozy of a question!
« on: April 23 2013, 07:02:43 PM »
on a pos-trac rear-end like on our cars,
If I'm carrying a spare tire quite abit smaller than the regular tire I'm running on the rear, whats gonna happen if I have to use it?
is the spare going to "skip" to stay at the same rotation as the other wheel?
or does the differantial compensate so they can both rotate at the same speed?
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Offline PacecarTA

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Re: I got another doozy of a question!
« Reply #1 on: April 23 2013, 07:48:57 PM »
it will seem to drive normal but what will happen is the posi will be actively slipping as long as you drive and it will overheat and damage the posi clutches
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Offline earlbrown

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Re: I got another doozy of a question!
« Reply #2 on: April 23 2013, 11:07:25 PM »
Smaller, skinnier, is fine. The circumferences have to match to keep the clutches from having to slip to compensate.
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Offline tb3

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Re: I got another doozy of a question!
« Reply #3 on: April 24 2013, 07:19:26 PM »
awesome info!!!   :rock:     thanks guys!
so then,  if I where to have a blow-out on the back,... I would need to make sure my spare is the same height,...or, if its not, and my fronts are the same size as my rear, then I should put a front on the rear and my spare on the front to not do damage.
 
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Offline daveismissing

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Re: I got another doozy of a question!
« Reply #4 on: April 24 2013, 08:40:44 PM »
ALSO READ HOW FAST YOU ARE SUPPOSED TO GO WITH A SPACE SAVER SPARE
You might be surprised
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Offline earlbrown

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Re: I got another doozy of a question!
« Reply #5 on: April 25 2013, 03:34:42 AM »
you'd also be surprised just how much faster you can go on a toy tire :)
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Offline bryes

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Re: I got another doozy of a question!
« Reply #6 on: April 25 2013, 08:49:03 PM »
I had an `87 escort awhile back and couldn't afford new tires, so I drove the entire summer on the Ohio turnpike with space savers. Being from Akron, I asked a retired tire engineer (--I know this will sound like another internet story, but he's respected worldwide and has written volumes on tires---) what he thought about my situation. I remember in particular asking him about the speed requirement of 50 mph, and what would happen if I drove faster. His reply was  that  I shouldn't be worried about the speed, but I should pay close attention to the tread wear, explaining that the spares were made out of soft rubber, not steel belted, and would wear out very quickly. He was right about that for sure, by the end of the summer the spare was bald :rock:

He explained that the speed and mileage restrictions were not really because of the quality of construction of the spares themselves, but instead were intended to prevent the wear, braking and stability issues from having a small tire. Since in my escort space savers were the same size as the regulars, I didn't have these issues.
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Offline tb3

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Re: I got another doozy of a question!
« Reply #7 on: April 26 2013, 06:08:50 PM »
good info brye's!
Its good to know I'm still ok running my skinny spares on the fronts at the drag strip  :rock:
 
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