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Old 05-27-2009, 07:46 AM   #1
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KDW2's flat spotting over night?

Some mornings I seem to get the wheel shake of an unbalanced wheels and on the commute home they are fine. I guess these tires are flat spotting over night on the cool concrete floor and are fine as the ambient temps come up thru the day.

Anyone else experience this? It's really frigging annoying. Maybe I can park on some thick cardboard to see if it makes a difference.


From Tire Rack:

Do you ever feel a ride disturbance or shimmy during the first few miles of driving after your vehicle has been parked for a few days, weeks or months? Then, after you drive a couple of miles, the ride smoothes out and feels OK. This condition is often called flatspotting because it is used to describe the tire flatspots that can occur when a vehicle is parked.

Many heavy duty, high performance, high speed rated and racing tires have a memory because they continue to remember the position in which they were last parked after they begin to be driven on again. Unfortunately, their memory can become a problem when the tires experience big swings in ambient temperature, have been parked overnight in cold temperatures, or parked for an extended period of time...because it's a lack of use that can cause tires to flatspot.

As they roll, tires go from a relaxed state to a loaded state about 800 times every mile. This constant deflection generates heat that makes the tires more flexible. But once they are parked, the spot in contact with the ground (the tire's footprint) flattens as it is pressed against the road's flat surface as the tires cool. This is what generates flatspots. And until the tires "warm up" again, the flatspot on each tire can cause a ride disturbance that will be felt for the first few miles the next time the vehicle is driven.

Flatspotting can be temporary (the tire will round out as driving warms it up) or in the most severe cases, permanent (in which the tire's memory effectively destroys its ride quality). A flatspot's severity is often a function of the tire size, internal structure, load, ambient temperature and time.

Low aspect ratio tires have less sidewall flex due to their short sidewalls and much of their load carrying capacity is absorbed by the deflection of their wide footprints.

The tread compounds and firm, nylon reinforced internal constructions used on high performance and high speed rated tires are more susceptible to flatspotting.

Heavy loads and too little air pressure in the tires (underinflation) will allow them to deflect more where they come into contact with the ground. This allows even more deflection, increasing the severity of the flatspotting.

Cold ambient temperatures make rubber compounds stiffer, increasing their tendency to flatspot.

The longer tires remain stationary, the better they remember the position in which they were last parked. Tires on vehicles stored on the ground for many months can be permanently flatspotted.
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Old 05-27-2009, 07:50 AM   #2
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are you sure its not a bent wheel?
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Old 05-27-2009, 08:01 AM   #3
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we have the same tires on the g/f's car and we have the same issue. the issue usually goes away while driving. and yes this is related to temperature. we noticed that once you drive the car a little aggressively and get the temp back up in the tires they ride just fine.

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Old 05-27-2009, 08:18 AM   #4
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Even the BFG gforce sports I have on my Aero do it, but prob not as bad as KDW's
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Old 05-27-2009, 08:36 AM   #5
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Forgot to mention the tires were road force balanced this spring. Wheels are straight.

Ok, so others notice this too. I guess I will have to work some heat in the tires like the F1 drivers do before the start.
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Old 05-27-2009, 11:06 AM   #6
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Get some F1 tire blankets
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Old 05-27-2009, 12:24 PM   #7
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I had Yokohama AVS ES100s on my old Honda, did the same thing. I worked overnight, and the ride home was rough, but after a drive they were fine.
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Old 05-27-2009, 12:51 PM   #8
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We actually had a 03 9-5 Aero bought back because of tires flat spotting. We tried differant tires and no mater what we did the tires would flat spot over night. The customer lived on a NEW black top road, so every morning he went to work it shook, by the time he came home the tires were warm when he hit the smooth road. It was very frustrating as the customer was a good friend of ours
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Old 05-29-2009, 12:21 PM   #9
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mine has been sitting for months and no problems at all..
bad batch?
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Old 05-29-2009, 12:23 PM   #10
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my cooper zeon 2xs tires do the same thing when they're cold
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Old 05-29-2009, 01:26 PM   #11
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Tires with a softer sidewall will do this, more so when it's cold
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Old 05-29-2009, 01:37 PM   #12
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my tires shake.. but that is because they are chopped... and the heavy super aeros haven't been balanced correctly.

i had this happen on my eclipse though... in ND it got to 20 at night and 120 in the day so really big swing... plus i would drive it like i stole it home and then park it so i am sure that didn't help.

on the balancing.. where should i go in the Milford NH area to have the wheels balanced right and the weights put on the inside...?
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