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Flat spots in tires...

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Old Oct 13, 2008 | 11:21 PM
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Default Flat spots in tires...

I switched wheels over from my convertible Camaro which was sitting all winter and a good portion of the spring. Apparently, the sitting threw the tires out of wack and there are "flat spots" in the tires that make them a little wobbly. I took them to get balanced today and the tire tech showed me that they were off when they were spinning on the balancer. He proceeded to balance them and they feel better. He claimed, however, that they will have permanent flat spots in them.

How can this be avoided or at least minimized? Do those tire cradle things work? Jackstands?
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Old Oct 14, 2008 | 12:12 AM
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Today's tires will normally straighten themselves out in a few miles. They do on my C4 after sitting all winter, but it's pretty rough at first.
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Old Oct 14, 2008 | 12:39 AM
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I agree with 87SAM. I have a ZR 1 that has sat in one spot for as much as several months, and my 63 sat for very long periods, and in both cases there was no problem, or the problem went away after some driving to warm up and flex the tires. Assuming that the tires, regardless of brand are at least OEM quality for the Corvette, I cannot imagine that your service guy was correct. I have heard this discussed many times, and never has anyone suggested that is was permanent. Obviously there could be some exceptional circumstances, but your description did not mention any. Try to drive the car enough to really warm the tires up, and then some. I say you will be fine. By the way, in a non ABS car, locked up braking will flat spot a tire permanently, but I assume that is not your case?

Regards
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Old Oct 14, 2008 | 11:20 PM
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put your car on jack stands during storage..
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Old Oct 14, 2008 | 11:38 PM
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Originally Posted by RenoReno2
put your car on jack stands during storage..
Not necessarily the best for a Corvette, as there is always a debate on how this affects the suspension when hanging. Forty pounds of air in the tires should suffice.
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Old Oct 15, 2008 | 12:22 AM
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Originally Posted by 87SAM
Not necessarily the best for a Corvette, as there is always a debate on how this affects the suspension when hanging. Forty pounds of air in the tires should suffice.
It might but as you said above it really isn't necessary. A few miles and the flat spots are gone.

Bill
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Old Oct 15, 2008 | 07:26 AM
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Here you go. Try these next winter!

http://www.raceramps.com/flatstoppers.html
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Old Oct 15, 2008 | 07:47 AM
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Originally Posted by threewinmag
Here you go. Try these next winter!

http://www.raceramps.com/flatstoppers.html
As mentioned above, you don't need them. I've been storing the Vette every winter for years and have never experienced a flat-spotting problem. Just drive it a few miles.
Ed
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Old Oct 15, 2008 | 08:43 AM
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I've been storing cars for the winter since the mid 70s. I generally won't put them on stands for two reasons: 1) the suspension hang or frame twist deal; 2) in case of an emergency, it's easier to move the car if it's already on the ground.

I pump the tires to 40 lbs. and put a couple of pieces of cut up rug squares under each tire.
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Old Oct 16, 2008 | 05:41 AM
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Originally Posted by Bill Dearborn
It might but as you said above it really isn't necessary. A few miles and the flat spots are gone.

Bill
And as Leadfoot4 suggests, Put something between the tires and concrete, ground, etc., to retard moisture and tire rot during storage.
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Old Oct 16, 2008 | 07:28 AM
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I usually put the cars on jackstands over the winter,but I place the jackstands under the A-arms and rear suspension so the suspension isn't hanging and it is compressed like it was sitting on the ground.
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Old Oct 16, 2008 | 07:51 PM
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I've read in the past (don't remember where) where 50-55 lbs of air will not cause the tires to flat-spot. I've tried this and have not had a problem with the tires flat-spotting.
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Old Oct 16, 2008 | 08:55 PM
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Originally Posted by leadfoot4
I pump the tires to 40 lbs. and put a couple of pieces of cut up rug squares under each tire.
Me Too
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Old Oct 17, 2008 | 12:17 AM
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Originally Posted by leadfoot4
I pump the tires to 40 lbs. and put a couple of pieces of cut up rug squares under each tire.
I leave mine at 30psi and park the car on four pieces of plywood to insulate the tires from the moisture in the concrete. It sits there for about 5-6 months each year, depending upon the weather. Never had a flat-spotting problem.
Ed
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Old Oct 17, 2008 | 07:25 AM
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Originally Posted by gmfn86
I've read in the past (don't remember where) where 50-55 lbs of air will not cause the tires to flat-spot. I've tried this and have not had a problem with the tires flat-spotting.
On some of the cars I've stored in the past, I replaced the OE wheels with something that had a little more pizazz. I then had the luxury of putting put a set of old tires on the OE wheels, to use for winter storage. Flat spots were then of no concern.

When I first got my C-5, I wasn't in that position, so I spoke with a GoodYear service rep who told me that 40-45 lbs. of air pressure would help alleviate the flat spots during winter.
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Old Oct 17, 2008 | 07:37 AM
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The next time you store them there are two things to minimze flat spots...
1. pump up the tires to the side wall maximum...just remember to drop the pressure to 30psi when you put it back on the road!
2. go buy a sheet of colored extruded styrofoam board from HomeDepot/Lowes. Buy the mre expesnive ( higher R value, more dense) variant Get it about 1 1/2 to 2 inches thick. Cut the board into 4 pieces jack the car and put one piece under each tire.
The foam board will deform to match the exact shape of the tire and spread the weight over a much larger surface area. This is the smart mans' home made version of the expensve tire cradles.
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Old Oct 17, 2008 | 08:06 AM
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Originally Posted by rws.1
....go buy a sheet of colored extruded styrofoam board from HomeDepot/Lowes. Buy the mre expesnive ( higher R value, more dense) variant Get it about 1 1/2 to 2 inches thick. Cut the board into 4 pieces jack the car and put one piece under each tire.
The foam board will deform to match the exact shape of the tire and spread the weight over a much larger surface area. This is the smart mans' home made version of the expensve tire cradles.

Why not just bevel the ends at a 45 degree angle,so you can simply drive the car on them?
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Old Oct 17, 2008 | 09:22 AM
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Originally Posted by leadfoot4
I've been storing cars for the winter since the mid 70s. I generally won't put them on stands for two reasons: 1) the suspension hang or frame twist deal; 2) in case of an emergency, it's easier to move the car if it's already on the ground.

I pump the tires to 40 lbs. and put a couple of pieces of cut up rug squares under each tire.
I'm with you.....I have 1/4 inch plywood down under two cars in the garage and I use old carpet under the Corvette tires if I dont drive it for 4+ weeks. Helps to soften the effect of the concrete floor.
I have had flat spots in other car tires and they disappeared after I ran the car for 10-15 minutes.
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Old Oct 17, 2008 | 10:29 AM
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Originally Posted by Joel Forman
I'm with you.....I have 1/4 inch plywood down under two cars in the garage and I use old carpet under the Corvette tires if I dont drive it for 4+ weeks. Helps to soften the effect of the concrete floor.
I have had flat spots in other car tires and they disappeared after I ran the car for 10-15 minutes.
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