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11-14-2007, 05:55 PM
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Hummer Authority
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Re: Spare Tire question.
I kwow that on a Corvette, it's a bad idea to mout a smaller diameter tire on the rear as a spare, as the Vette has a positraction rear axle. It would cause the the posi clutches to activate in the rear and burn them out while traveling in a straight line since one tire's outside diameter is smaller then the other.
In other words, the rear diff would think it's turning a corner. Now.if the H3's diff has posi clutches..it's a No-No..!! Not sure if the 3's diff's are posi..??
Are they..???
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11-14-2007, 07:17 PM
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Hummer Expert
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Location: North Texas
Posts: 523
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Re: Spare Tire question.
What about all those cars that come with a compact size spares? If I remember, they have a qualifier -- like "45 mph and 50 miles." I'm having trouble seeing how a 1" smaller diameter spare could be a problem if only used "sparingly". LOL.
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Jim
2003 H2 Metallic Red (now gone)
2008 H3 Graphite Lux
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11-14-2007, 07:22 PM
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Re: Spare Tire question.
Quote:
Originally Posted by Texas Red
What about all those cars that come with a compact size spares? If I remember, they have a qualifier -- like "45 mph and 50 miles." I'm having trouble seeing how a 1" smaller diameter spare could be a problem if only used "sparingly". LOL.
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I think those are still the same outside diameter as the oiginal tire...just thinner.

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11-15-2007, 08:09 PM
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Re: Spare Tire question.
Quote:
Originally Posted by Viet Nam Vette
I think those are still the same outside diameter as the oiginal tire...just thinner.
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Wrong, they are quite a bit smaller in diameter as well as being thinner. And worrying about using a 265 with 285s temporarily is just ridiculous.
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11-14-2007, 09:21 PM
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Hummer Guru
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Location: In a FREE U.S.A. where Marxism, Socialism & Communism is not allowed !
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Re: Spare Tire question.
Quote:
Originally Posted by Texas Red
What about all those cars that come with a compact size spares? If I remember, they have a qualifier -- like "45 mph and 50 miles." I'm having trouble seeing how a 1" smaller diameter spare could be a problem if only used "sparingly". LOL.
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you right, if its just for an emergency use the 265 till you can get the tire that went flat repaired. You just don't want to go hundreds of miles on the 2 different sizes...
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11-15-2007, 08:13 PM
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Re: Spare Tire question.
Quote:
Originally Posted by Viet Nam Vette
I kwow that on a Corvette...has a positraction rear axle.
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Wrong there, too. Corvettes come standard with a limited-slip differential.
Don't think I've ever seen so much misinformation in one thread. 
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11-15-2007, 10:45 PM
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Re: Spare Tire question.
Quote:
Originally Posted by TXSUT
Wrong there, too. Corvettes come standard with a limited-slip differential.
Don't think I've ever seen so much misinformation in one thread. 
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Wrong.. I own a 65 Corvette with a ZZ502 BB with Posi. Go on any Corvette forum and mention using a smaller diameter tire on one side on the rear with a Posi axle and see what kind of reaction you get.
And for your information .."Limited Slip" And "Posi Traction" are the same thing.
If you know how a posi works then you know that when one wheel slips, it slips against the internal posi clutches when traveling in a straight line. If you use a smaller diameter rear tire on a Corvette on one side of the rear, the clutches will slip all the time and burn up. Both wheels have to turn at the same speed to prevent the posi from engauging.
That's not missinformation ..But Fact
Don't think I've seen so much miss information from you. 
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11-15-2007, 10:53 PM
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Re: Spare Tire question.
Quote:
Originally Posted by Viet Nam Vette
And for your information .."Limited Slip" And "Posi Traction" are the same thing.
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That I know. I put my damn smilie face in the wrong place.
I was just trying to mess with you (GM stopped calling it a Positrac quite a while back), because even on a "positrac" rear end, using a smaller diameter tire for a short distance won't hurt anything....Vette forums be damned! LOL
I've owned 3 Vettes, so I know just a *little* about them. 
Last edited by TXSUT : 11-15-2007 at 10:56 PM.
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11-15-2007, 11:07 PM
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Re: Spare Tire question.
Quote:
Originally Posted by TXSUT
That I know. I put my damn smilie face in the wrong place.
I was just trying to mess with you (GM stopped calling it a Positrac quite a while back), because even on a "positrac" rear end, using a smaller diameter tire for a short distance won't hurt anything.
I've owned 3 Vettes, so I know just a *little* about them. 
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I've owned 9 Vette's in my time and hang on a Corvette forum where one of it's members is "John Z". John was a Drive Line Engineer back in the 60's and worked under "Zora" on the Corvette.
The spare tire topic came up once and went thru 2-3 pages. Most guys now use radial tires on there Mid-Years..(63-67) Corvettes. The problem is that that a spare radial doesn't fit flush in the spare tire carrier under the car. It hangs down due to it's thickness and in some cases it's diameter.
Someone posted the question about using a tire that was smaller in diameter then what he had on the car. John addressed what I have typed in regaurds to damaging the clutches. In other words... It's a Bad Idea.
Going a 100 feet or so might be ok, but remember...those clutches get hot fast and will burn up if the axle doesn't lock up.
When John Z talks..... Everyone listens..

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11-16-2007, 01:21 AM
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Re: Spare Tire question.
This horse is dead.
While I have your attention though, let me thank you for your service to our Country...and I do mean that seriously and sincerely. (We need a US Flag emoticon on this website.)
Pete
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11-16-2007, 03:30 AM
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Re: Spare Tire question.
Quote:
Originally Posted by TXSUT
This horse is dead.
While I have your attention though, let me thank you for your service to our Country...and I do mean that seriously and sincerely. (We need a US Flag emoticon on this website.)
Pete
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Thanks Pete... I Appreciate that, Thank You. 
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11-16-2007, 04:13 AM
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Banned
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Join Date: Feb 2005
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Re: Spare Tire question.
Quote:
Originally Posted by Viet Nam Vette
The problem is that that a spare radial doesn't fit flush in the spare tire carrier under the car. It hangs down due to it's thickness and in some cases it's diameter. 
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I guess that means you can't take your 'vette off road.  
Quote:
Originally Posted by Viet Nam Vette
thank you for your service to our Country...and I do mean that seriously and sincerely.x1,000,000
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11-16-2007, 04:47 AM
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Re: Spare Tire question.
Only when you put your foot in it ..in first gear..Then your off road.

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11-16-2007, 02:14 PM
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Re: Spare Tire question.
Quote:
Originally Posted by Viet Nam Vette
I own a 65 Corvette
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Got any pics you can post...would LOVE to see it! 
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11-16-2007, 04:42 PM
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Hummer Authority
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Re: Spare Tire question.
Quote:
Originally Posted by TXSUT
Got any pics you can post...would LOVE to see it! 
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Here's one before the 502 Conversion...
Dec 2006 After the 502 Install Which was completed in 2004.

Last edited by Viet Nam Vette : 11-16-2007 at 04:51 PM.
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11-16-2007, 06:16 PM
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Re: Spare Tire question.
Absolutely gorgeous. Can someone hand me a towel.
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11-16-2007, 06:28 PM
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Re: Spare Tire question.
Quote:
Originally Posted by TXSUT
Absolutely gorgeous. Can someone hand me a towel.
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Thanks Pete.. 
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