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Old 06-19-2002, 10:49 AM   #1
Jon Bogert
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Question Full size spare strategy with directional tires

Assumption: You're running directional tires, not necessarily in the stock size.

The scenario: a long trip, driving late Sunday night, gotta get home for work on Monday. Middle of nowhere and *bam* a flat tire. With the stock donut you're SOL, since you've got 300 miles to go and you certainly can't drive below 50. No place to get a tire repaired, assuming it is even repairable. A gas station will sell you a crap tire for $200, if they even have the right size.

A complicaton: you run winter tires in the winter, so your spare has to be compatible with both sets, or you need two spares.

So what do you do in preparing for this situation?

I'm beginning to think that a non-directional, all season M+S rated, H-rated tire on a rim that will fit on any corner (over front brakes) is the solution. It will work with summer tires, or with snows, at 100 mph on an empty highway, or down a dirt road in the middle of the woods. Unlike a dount, it will get you home through any conditions. Tire wear and pressure differences can easily result in 1% difference in rolling radius between the same tire in the same size, so as long as the size is close, it won't be that big a deal.

What do you think?
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Old 06-19-2002, 12:19 PM   #2
slowme
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I think you have a good point. I hate donuts.

Bill
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Old 06-19-2002, 02:19 PM   #3
paultg
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Yeah, very good points.

I did a test with the tires I owned for my 2.5RS last year, and was pretty surprised at the %difference in tire diameter. I don't kow if my test method was the most accurate though.

Here is a link to my findings:
http://forums.nasioc.com/forums/show...highlight=tire
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Old 06-19-2002, 02:45 PM   #4
Jon Bogert
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Paul you shouldn't post good stuff like that in a regional forum!

Interesting info. Maybe our cars aren't as sensitive to different size tires as I thought. I know that Audis with Torsen diffs go nuts with slight differences--probably because they're geared. I guess it makes sense that a VC wouldn't even notice a 5% difference. It makes sense that it takes at least a few turns per second before the fluid started to heat up and limit slip.
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Old 06-19-2002, 03:39 PM   #5
paultg
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I wasn't sure how valid my test method was, so I was afraid I'd get slammed in the "suspension forum" for not being "exact" with all the info, like how many miles were on each set, etc..

I did drive on the spare tire at one point with the Prodrive 17" rims and 205/50R17 tires, and I didn'ty have a problem. I did keep it slow, and only went about 5 miles to have the tire plugged. I stick to stock tire sizes now and 16" rims, after I bent a Prodrive P7.

I'm going to go through this test again with the new WRX wagon once I get all the rims/tires swapped around. I'll have (will have):

205/55R16 Michelin Artic Alpine on 16" Steel rims
(same tires from the last test)
205/55R16 Re-92's on '01 RS rims (no idea how many miles)
205/55R16 Falkan Azeinas (new) on '99 RS rims
Stock WRX Spare Tire (not sure on size yet)

It will be interesting to see what happens. One thing nice about the WRX wagon is I think a full spare will fit in the tire well if you leave the storage tray out of the car.

On a side note, everyone should check the air pressure of the spare. Mine was way low when I had to use it the first time, and I was lucky the gas station was only 1/8 mile away.

Paul G.
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Old 06-19-2002, 06:08 PM   #6
Blindeye_03
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Default Re: Full size spare strategy with directional tires

Quote:
Originally posted by Jon Bogert
Assumption: You're running directional tires, not necessarily in the stock size.

The scenario: a long trip, driving late Sunday night, gotta get home for work on Monday. Middle of nowhere and *bam* a flat tire. With the stock donut you're SOL, since you've got 300 miles to go and you certainly can't drive below 50. No place to get a tire repaired, assuming it is even repairable. A gas station will sell you a crap tire for $200, if they even have the right size.

A complicaton: you run winter tires in the winter, so your spare has to be compatible with both sets, or you need two spares.

So what do you do in preparing for this situation?

I'm beginning to think that a non-directional, all season M+S rated, H-rated tire on a rim that will fit on any corner (over front brakes) is the solution. It will work with summer tires, or with snows, at 100 mph on an empty highway, or down a dirt road in the middle of the woods. Unlike a dount, it will get you home through any conditions. Tire wear and pressure differences can easily result in 1% difference in rolling radius between the same tire in the same size, so as long as the size is close, it won't be that big a deal.

What do you think?

Hmmm...Well you COULD drive on the doughnut. I had my re92 blow out (my rear pass tire) while I was in NC on a Thursday night (coming home from vacation early). I pull over and my friend helps me put my front pass tire to my rear pass area, so I could put the doughnut on the front pass. I drove 400 miles on the doughnut @ 70mph. The front differential is OPEN (atleast on the RS and the US wrx *IIRC*), so it didnt hurt a darn thing.

Lets just say I was happy it didnt blow, but that bad boy is sturdy. The tire place said the tire wear looked great & all it needed was a little more air.

But its a different story if you have 4pots.

lata,
-justin
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Old 07-23-2002, 03:38 PM   #7
Rally1
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I would just take one of my stock tires/wheels with me (and lugs) it has the same rotation distance, so that should work right? wait that is a directional tire uh.

Even better, mount it on the trunk

hehe:

Last edited by Rally1; 07-23-2002 at 04:07 PM.
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Old 07-23-2002, 10:46 PM   #8
Jon Bogert
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Gotta get one of those for my RS. Probably would have less drag than some of those aftermarket Honda wings.
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