Noise while driving.... flat spot on tire??? - Hyundai Forums : Hyundai Forum
 
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#1 Old 05-16-2012, 01:48 PM
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Noise while driving.... flat spot on tire???

Lately, I've been hearing a sound while driving around 40-50mph. Sounds like a 'whoping' noise and I think it's from the tires.

I've started noticing the noise ever since I came back from vacation over a week ago. I was gone for a week.

My main question is, will a flat spot develop if the car has been left parked for at least a week?

They are kumho tires and my only experience with kumho is that they do develop flat spots as I drove a car that sat in my driveway for 6 months. That was my very first car and so I was a total car noob. The tire lasted me about 7 months before the tread on the kumho ripped off but did not blow out.

Another question... what tire pressure do you run your tires at?
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#2 Old 05-16-2012, 02:31 PM
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The only time I've seen tires develop flat spots is when they've sat in sub zero temperatures for a long time.. You might be seeing a tread separation causing the tire to go out of round. A trip to the dealer would would confirm this. The warranty should cover most of it..

The 'correct' tire pressure is displayed on the sticker on the lower part of the driver's door pillar. It should be 32 PSI.. I cheat a bit and go to 34 with the hopes I get a bit better mileage...
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#3 Old 05-16-2012, 02:43 PM
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Forgot to add that the noise goes away when going above 60mph and I've heard it both on asphalt and concrete roads.

Anyway, I had my tires at 38psi for over 3 months now. It's surprising it hasn't gone down. When the tires were at 32psi, the pressure dropped in one tire over the course of 2 months, enough to set the TPMS off and the resulting pressure was 20psi.

I'll deflate them a bit and see if that helps any with the noise.
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#4 Old 05-16-2012, 03:41 PM
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Actually, a speed dependent noise is a symptom of an out of round tire or a separated tread. (But it's not a guarantee that this is actually the problem). I had some Firestone tires years ago and the treads on all four tires separated badly. I had a steering wheel shimmy at low speeds, but it smoothed out when I went over 30.

For the pressure.. It all depends on the weight the tire has to support. If you don't have enough pressure in the tire, the center of the tread will cup in and the outsides of the tread will wind up supporting the weight of the car.. If you over inflate, the center of the tread will bulge out and the center of the tread will support most of the weight of the car. In both cases, you get less traction and uneven wear. The correct pressure allows the weight of the car to be spread evenly across the tread.

Tire manufacturers provide charts where you can look up the weight the tire has to support and determine the correct pressure. Unfortunately they don't make these charts readily available to the public, so you basically have to believe what Huyundai says about the tires on your car.

There's a good article on tire pressure etc here --> A+ Auto Services | Mechanics & Auto Shops In Calgary | Calgary Auto Repair - Automotive Repair
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#5 Old 05-16-2012, 07:19 PM
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Yeah, I'm thinking this is sounding like an out of round issue.

Could possibly be a balance issue, but I'm leaning towards out of round.

If it ain't broke, fix it till it is.
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#6 Old 05-18-2012, 07:15 AM
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Hi meickey here from the philippines,

Have had the same issue, and we do have the same tire brand too.

Mine is Kumho Ecsta 195/50/R16 tires... Already bring the car to my dealer, and they replaced the rear right hub bearing. However, the problem is till there, thus I am suspecting the tire is out of round.. Already brought the car to the shop to balance the wheels, however the problem is still there...

And yeah, the same symptoms as the noise is gone at 60-80kph.... And as described, it's a whooping sound too at low speed...

I might be changing my tires in a couple of weeks...

here is my unit by the way..


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#7 Old 05-19-2012, 07:41 PM
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The stock Kumhos just plain suuuuck.
Our Sonatas got so noisy at speed we replaced them with Yokohama Avid TRZs, was a constant whoooom whooom whooom sound on the highway.
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#8 Old 05-19-2012, 09:44 PM
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Quote:
Originally Posted by hyunnychub View Post
The stock Kumhos just plain suuuuck.
Our Sonatas got so noisy at speed we replaced them with Yokohama Avid TRZs, was a constant whoooom whooom whooom sound on the highway.
Yes, they do suck! When I bought my car new, I almost bought 4 new tires for it in the first month. I just replaced my Kumho crap with Generals, and the ride and noise improved. It rides better than when new now. You may want to invest in 4 new tires, you will feel better about the car and ride if you do. I also suggest having the tires looked at, you could have tread seperation, and you don't want a blowout since you have no spare tire in a '12 Accent.
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#9 Old 05-20-2012, 08:59 AM
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The Kumhos are pretty terrible.

I'll wear these down to the indicator (looks like it shouldn't take too much longer tonget there) and get some stickier tires. Maybe upsize to 205.

If it ain't broke, fix it till it is.
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#10 Old 06-18-2012, 11:23 PM
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kidashley25
By far, the most common cause of flat spot on wheels is storage space. If a car is left too long in the same place, the contact spot the area of rim in contact with the earth can become firm. This is more intense in freezing and with under-inflated wheels. Once you start driving again, if you have smooth areas, you will likely observe a shimmy or shake. Then, as the wheels heated and the silicone "relaxes," the shimmy might be demure or vanish completely, but the wheels are still risky, especially if they are not effectively filled.

To prevent flat spotting from seated, use a rim support that markets weight and maintains your tire's shape. For extended storage space, put your car on port appears and store the wheels on their factors.tire flat spotting would be most recognizable when starting to generate a automobile that has been saved incorrectly you can ask some auto repair shops for other info on flat spot.
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